Synthesis, Characterization, and Formation of Self-Assembled Monolayers of a Phosphonic Acid Bearing a Vinylene-Bridged Fluoroalkyl Chain
Shirai; T.; Yamauchi; S.; Kikuchi; H.; Fukumoto; H.; Tsukada; H.; Agou; T.
Applied Surface Science, 2021年11月, ［査読有り］

Unsymmetrical Hexafluorocyclopentene-Linked Twisted π-Conjugated Molecules as Dual-State Emissive Luminophores　　　　　　　　　　　　　　　
Yamada; S.; Nishizawa; A.; Kobayashi; K.; Yoshida; K.; Morita; M.; Agou; T.; Hosoya; T.; Fukumoto; H.; Konno; T.
Symmetry, 2021年09月, ［査読有り］

Synthesis and photoluminescence properties of fluorine-containing poly(phenylene vinylene) bearing hexaflurocyclopentene-fused phenanthrene unit
Fukumoto; H.; Shiitsuka; K.; Yamada; K.; Yamada; S.; Konno; T.; Kubota; T.; Agou; T., 筆頭著者, Wiley
Polymer International, 2021年08月, ［査読有り］

Fused-Nonacyclic Multi-Resonance Delayed Fluorescence Emitter Based on Ladder-Thiaborin Exhibiting Narrowband Sky-Blue Emission with Accelerated Reverse Intersystem Crossing　　　　　　　　　　　　　　　
Nagata; Masakazu; Min; Hyukgi; Watanabe; Erika; Fukumoto; Hiroki; Mizuhata; Yoshiyuki; Tokitoh; Norihiro; Agou; Tomohiro; Yasuda; Takuma
Angew. Chem., Inter. Edit., 2021年04月, ［査読有り］

Synthesis, Structure, and Surface Properties of Polyacrylates Poly(meth)acrylates Bearing a Vinylene-Bridged Fluoroalkyl Side Chain　　　　　　　　　　　　　　　
Shirai; T.; Fukumoto; H.; Kanno; Y.; Kubota; T.; Agou; T.
Polymer, 2021年01月, ［査読有り］

Practical Synthesis of α‐Trifluoromethylated Pyridines Based on Regioselective Cobalt‐Catalyzed [2+2+2] Cycloaddition using Trifluoromethylated Diynes with Nitriles　　　　　　　　　　　　　　　
Kumon; T.; Yamada; S.; Agou; T.; Fukumoto; H.; Kubota; T.; Hammond; G. B.; Konno; T.
Advanced Synthesis and Catalysis, 2021年01月, ［査読有り］

Facile preparation of α,ω-diynes bearing a perfluoroalkylene linker -(CF2)n- (n = 4,6) and their application for Co- or Rh-catalyzed [2+2+2]cycloaddition reactions affording aromatic compounds with perfluoroalkylene units
Agou; Tomohiro; Saruwatari; Shogo; Shirai; Tomohiro; Kumon; Tatsuya; Yamada; Shigeyuki; Konno; Tsutomu; Mizuhata; Yoshiyuki; Tokitoh; Norihiro; Sei; Yoshihisa; Fukumoto; Hiroki; Kubota; Toshio, Elsevier BV
J. Fluorine Chem., 2020年06月, ［査読有り］

Visible-Transparent Aromatic Polymers Obtained by the Polycondensation of a Bis(trifluorovinyl)benzene with Bisphenols
Agou; Tomohiro; Yoshinari; Kazuto; Shirai; Tomohiro; Yamada; Shigeyuki; Konno; Tsutomu; Mizuhata; Yoshiyuki; Tokitoh; Norihiro; Yasuda; Sana; Yamazaki; Takashi; Fukumoto; Hiroki; Kubota; Toshio, A polycondensation of 1,4-dimethoxy-2,5-bis(trifluorovinyl)benzene (1) with bisphenols in the presence of K2CO3 afforded aromatic polymers 3 consisting of both the (E)- and (Z)-Ar-CF=CF-O-Ar' moieties in the main chains. The M-n and M-w values of polymer 3c prepared from bisphenol-AF were up to 6.62 x 10(4) and 1.29 X 10(5), respectively. The polymers 3 were transparent in the visible region (>400 nm) and exhibited good thermal stability (T-d5% > 320 degrees C). Fluorescence spectroscopy and X-ray diffraction analysis indicated the amorphous character of polymer 3c. The drop-cast film of 3c showed that the refractive indices and Abbe's number were comparable to those for widely used polymers having optical applications, such as polycarbonate and polystyrene., AMER CHEMICAL SOC
Macromolecules, 2020年04月, ［査読有り］

Helicenes Fused with Hexafluorocyclopentene (HFCP): Synthesis, Structure, and Properties
Agou; Tomohiro; Kohara; Masaki; Tamura; Yuuki; Yamada; Keisuke; Shiitsuka; Kazuki; Hosoya; Takaaki; Mizuhata; Yoshiyuki; Tokitoh; Norihiro; Hayashi; Yuki; Moronuki; Yusuke; Ishii; Akihiko; Tanaka; Yusuke; Muranaka; Atsuya; Uchiyama; Masanobu; Yamada; Shigeyuki; Konno; Tsutomu; Fukumoto; Hiroki; Kubota; Toshio, Helicenes fused with hexafluorocyclopentene (HFCP) were synthesized by oxidative photocyclization of stilbene derivatives (the Mallory reaction). Of the newly-obtained fluorinated helicenes, the [7]helicenes bearing one- or three-HFCP units were structurally characterized by X-ray crystallographic analysis. The attempted synthesis of [9]helicene fused with three HFCP units resulted in the unexpected formation of a novel double helicene consisting of [4]- and [6]-helicenes sharing peripheral benzene rings. Optical properties and chiral resolutions of the newly obtained HFCP-substituted helicenes are also described., WILEY-V C H VERLAG GMBH
Eur. J. Org. Chem., 2020年03月, ［査読有り］

Pentacyclic Ladder-Heteraborin Emitters Exhibiting High-Efficiency Blue Thermally Activated Delayed Fluorescence with an Ultrashort Emission Lifetime
Agou, T; Matsuo, K; Kawano, R; Park, I. S; Hosoya, T; Fukumoto, H; Kubota, T; Mizuhata, Y; Tokitoh, N; Yasuda, T
ACS Materials Letters, 2020年, ［査読有り］

Effective synthesis of fluorine-containing phenanthrene bearing hydroxyl group using Mallory reaction and its application for fluorinated polymers
Kataoka, S; Fukumoto, H; Kawasaki-Takasuka, T; Yamazaki, T; Nishimura, K; Agou, T; Kubota, T
J. Fluorine Chem., 2019年, ［査読有り］

Synthesis and properteis of perfluoroalkylated TIPS-pentacenes
Agou, T; Suzuki, S; Kanno, Y; Hosoya, T; Fukumoro, H; Mizuhata, Y; Tokitoh, N; Suda, Y; Furukawa, S; Saito, M; Kubota, T, 責任著者
Tetrahedron, 2019年, ［査読有り］

Phosphines featuring a hexafluorocyclopentene skeleton: Synthesis, coordination properties, and applications for Lewis-acidic transtion-metal catalysts
Agou, T; Wada, N; Komatsu, M; Nohara, M; Mizuhata, Y; Tokitoh, N; Hosoya, T; Fukumoto, H; Kubota, T
Results in Chemistry, 2019年, ［査読有り］

A Straightforward Synthesis of Polyfluorinated Furan Derivatives and Their Property
Tomohiro Agou; Seiya Nemoto; Shigeyuki Yamada; Tsutomu Konno; Yoshiyuki Mizuhata; Norihiro Tokitoh; Ryota Ebina; Akihiko Ishii; Takaaki Hosoya; Hiroki Fukumoto; Toshio Kubota, An abbreviated synthesis of hexafluorocyclopentane-annulated 2,5-diarylfurans has been developed. 1,2-Dichloro-3,3,4,4,5,5-hexafluorocyclopentene was converted to corresponding polyfluorinated 1,2-diaroylalkenes, treatment of which with P(OEt)(3) afforded the polyfluorinated 2,5-diarylfurans. Solid-state photo-luminescence of the furan derivatives exhibited remarkable red-shifts compared to fluorescence emissions in solution, probably because of intermolecular interactions in the solid state. Comparisons of the optical and electrochemical data of the fluorinated furan derivatives with those of a non-fluorinated 2,5-diarylfuran suggest that the perfluorocycloalkane-annulation effectively enhances the electron-accepting ability of the 2,5-diarylfuran framework., WILEY-V C H VERLAG GMBH
ASIAN JOURNAL OF ORGANIC CHEMISTRY, 2018年12月, ［査読有り］

Synthesis of a new highly-fluorinated cis-1,2-cyclopentandiol and its application for fluorinated oligoesters　　　　　　　　　　　　　　　
Agou, T; Ohata, R; Mizuhata, Y; Tokitoh, N; Fukumoto, H; Kubota, T
J. Fluorine. Chem., 2018年, ［査読有り］

Syntheses and Structures of d10 Conage Metal Complexes of Electron-Accepting Phosphine Ligands Featuring a 3,3,4,4,5,5-Hexafluorocyclopentene Framework　　　　　　　　　　　　　　　
Agou, T; Wada, N; Fujisawa, K; Hosoya, T; Mizuhata, Y; Tokitoh, N; Fukumoto, H; Kubota, T
Inorg. Chem., 2018年, ［査読有り］

Facile transformation of 2H,3H-decafluoropentane (HFC-4310mee) into (Z)-2H-nonafluoropent-2-ene and its application to the synthesis of polyfluorinated homoallylic ketons by Claisen rearrangement　　　　　　　　　　　　　　　
Agou, T; Aso, D; Kataoka, S; Tuchimochi, R; Fukumoto, H; Yamazaki, T; Kawasaki-Takasuka, T; Mizuhata, Y; Tokitoh, N; Kubota, T
Journal of Fluorine Chemistry, 2018年, ［査読有り］

Fluorine-Containing Dibenzoanthracene and Benzoperylene-Type Polycyclic Aromatic Hydrocarbons: Synthesis, Structure, and Basic Chemical Properties　　　　　　　　　　　　　　　
Gotsu, O; Shiota, T; Fukumoto, H; Kawasaki-Takasuka, T; Yamazaki, T; Yajima, T; Agou, T; Kubota, T
Molecules, 2018年, ［査読有り］

Efficient Synthesis of Fluorinated Phenanthrene Monomers Using Mallory Reaction and Their Copolymerization
Hiroki Fukumoto; Masatoshi Ando; Tomomi Shiota; Hirokazu Izumiya; Toshio Kubota, The Mallory reaction of 1,2-diarylhexafluorocyclopentene (1, aryl = 3-bromophenyl; 2, aryl = 4-bromophenyl) under light irradiation (lambda = 365 nm) in the presence of iodide proceeded to give dibromophenanthrene derivatives, 3 and 4. Polycondensation of 9,9-dioctylfluorene-2,7-diboronic acid bis(1,3-propanediol)ester with the obtained monomers by Suzuki-Miyaura coupling afforded the phenanthrene-type copolymers Poly-3 and Poly-4 in high yields. For comparison, diphenylethene-type copolymers (Poly-1 and Poly-2) were also prepared analogously. UV-vis spectra of Poly-3 and Poly-4 in CHCl3 showed pi-pi* transition peaks at 380 and 354 nm, respectively, and additional shoulder peaks appeared at a longer wavelength in the film, suggesting the molecular assembly of the polymer molecules. In contrast, the spectra of Poly-1 and Poly 2 in solution were essentially unchanged as measured in the film, presumably owing to partial interruption of the pi-conjugation system in polymer main chains. The copolymers showed photoluminesence (PL) in both CHCl3 and the film., AMER CHEMICAL SOC
MACROMOLECULES, 2017年02月, ［査読有り］

Preparation and chemical properties of pai-conjugated polymers containing indigo unit in the polymer main chain
Fukumoto; H.; Nakajima; K.; Kojima; T.; Yamamoto; T., pi-Conjugated polymers based on indigo unit were prepared. Dehalogenative polycondensation of N-hexyl-6,6'-dibromoindigo with a zerovalent nickel complex gave a homopolymer, P(HexI), in 77% yield. Copolymer of N-hexyl-indigo and pyridine, P(HexI-Py), was also prepared in 50% yield. P(HexI) showed good solubility in organic solvents, whereas P(HexI-Py) was only soluble in acids such as HCOOH. The weight-average molecular weights (M-w) of P(HexI) and P(HexI-Py) were determined to be 10,000 and 40,000, respectively, by a light scattering method. Pd-catalyzed polycondensation between 6,6'-dibromoindigo with N-BOC (BOC = t-butoxycarbonyl) substituents and a diboronic compound of 9,9-dioctylfluorene afforded the corresponding alternating copolymer, P(BOCI-Flu), as a deep red solid in 98% yield. P(BOCI-Flu) was soluble in N-methyl-2-pyrroridone and showed an M-w of 29,000 in GPC analysis. Treatment of P(BOCI-Flu) with CF3COOH smoothly led to a BOC-deprotection reaction to give an insoluble deep green polymer, P(I-Flu), in a quantitative yield. Diffuse reflectance spectra of powdery P(BOCI-Flu) and P(I-Flu) showed peaks at about 580 nm and 630 nm, respectively, which are thought to originate from the indigo unit., MDPI AG
Materials, 2014年, ［査読有り］

Preparation and chemical properties of π-conjugated poly(1,10-phenanthroline-3,8-diyl)s with crown ether subunits
Fukumoto, H; Kase, Y; Koizumi, T; Yamamoto, T, pi-Conjugated polymers consisting of 1,10-phenanthroline units and crown ether subunits (Poly-1, Poly-2, and Poly-3) were prepared by dehalogenation polycondensation of the corresponding dibromo monomers using a zero-valent nickel complex as a condensing agent. They were characterized by elemental analysis, H-1 NMR and UV-Vis spectroscopies, and cyclic voltammetry (CV). They were partly soluble in CHCl3, and the number average molecular weight of the soluble part of Poly-2, which had 15-crown-5 subunits, was estimated to be 5300. The polymers exhibited UV-Vis peaks at approximately lambda(max) = 360 nm, which was reasonable. Complexation with [Ru(bpy)(2)](2+) and alkaline metal ions made the polymer soluble in organic solvents. The complexation of [Ru(bpy)(2)](2+) to the 1,10-phenanthroline unit proceeded quantitatively, and the [Ru(bpy)(2)](2+) complexes exhibited CV curves characteristic of [Ru(N-N)(3)](2+) complexes. (C) 2014 Elsevier Ltd. All rights reserved., ELSEVIER SCIENCE BV
Reactive and Functional Polymers, 2014年, ［査読有り］

Effects of solvent and temperature on regioregularity of poly(3-hexylthiophene-2,5-diyl) prepared by chemical oxidative polymerization
Fukumoto H.; Omori; Y.; Yamamoto; T., NATURE PUBLISHING GROUP
Polym. J., 2013年, ［査読有り］

Preparation of -conjugated polymers consisting of 1-aminopyrrole and 4-amino-1,2,4-triazole units
Koie, S; Tanaka, G; Fukumoto, H; Koizumi, T; Yamamoto, T, pi-Conjugated polymers based on 1-aminopyrrole and 4-amino-1,2,4-triazole were prepared. Pd-catalyzed organometallic polycondensation gave poly(arylene-ethynylene) (PAE)-type pi-conjugated polymers consisting of BOC-protected 4-amino-1,2,4-triazole (Taz(BOC)) units (BOC = t-butoxycarbonyl). The number average molecular weights (M-n) were determined to be 5200-19,200 using GPC. An alternating copolymer of Taz(BOC) and bithiophene (Th-Th) units, P(Taz(BOC)-Th-Th)(n)-Pd, with an M-n of 10,800 was also prepared by Pd-catalyzed organometallic polycondensation. (Taz(BOC)-Th-Th)(n)-Pd showed a UV-Vis absorption peak at lambda(max) = 425 nm, which is reasonable for a pi-conjugated five-membered ring polymer with a coplanar structure. The deprotection of the BOC group of the polymers proceeded at 200 degrees C; this BOC-deprotection was investigated using a model compound. The optical and electrochemical properties of the pi-conjugated polymers are reported. (C) 2013 Elsevier Ltd. All rights reserved., ELSEVIER SCIENCE BV
Reactive & Functional Polymers, 2013年, ［査読有り］

Copolymers of pyrrole with N-alkynylpyrroles
Takakazu Yamamoto; Yusuke Yamagata; Risako Yamashita; Mahmut Abla; Hiroki Fukumoto; Take-aki Koizumi, Electrochemical oxidative copolymerization was carried out between pyrrole and N-substituted pyrroles, Pr(C C-Ph) (Ph = phenyl) and Pr(C C-SiEt3), which have -C C-Ph and C C-SiEt3 groups, respectively, at the N-position of pyrrole. The electrochemical oxidation of Pr(C C-Ph) and Pr(C C-SiEt3) required potentials about 0.5-0.8 V higher than that of pyrrole because of the presence of the electron-pulling acetylenic group, and the electrochemical copolymerization gave copolymers with pyrrole-rich compositions. Copolymers of pyrrole with Pr(C C-Ph) showed an electrical conductivity of 2-6.3 S cm(-1). These copolymers showed thermal stability: 50-85 degrees C higher than the homopolymer of pyrrole. A dimeric compound of Pr(C C-Ph), i.e., (Pr-C C-Ph)(2), was prepared, and its X-ray crystallographic analysis essentially revealed a pyrrole-pyrrole coplanar structure; this supports the notion that the -C C-Ph group attached at the N-position of pyrrole does not break pi-conjugation in the polypyrrole main chain of the copolymer. (c) 2012 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE SA
SYNTHETIC METALS, 2012年12月, ［査読有り］

Field-effect transistors of the block co-oligomers based on thiophene and pyridine
Haemori; M.; Itaka; K.; Yamaguchi; J.; Kumagai; A.; Yaginuma; S.; Fukumoto; H.; Matsumoto; Y.; Yamamoto; T.; Koinuma; H., We have investigated the structural and electrical characteristics of two kinds of block co-oligomers, 5,5"-Bis(2-pyridyl)-2,2':5',2"-terthiophene (5A) and 2,5-Bis(2-(2'-thienyl)-pyridine-5-yl)thiophene (5B), which are composed of electron-donating thiophene and electron-withdrawing pyridine rings. At the view of building block units, the amount of the module units included in these molecules is completely equivalent to each other. X-ray diffraction patterns of 5A and 5B thin films grown on atomically flat alpha-Al2O3 (0001) substrates indicated a high degree of orientation along the c-axis. Field-effect transistors (FETs) of 5A and 5B thin films were fabricated and evaluated without exposure to air. The FETs based on 5A active layers exhibited p-type behavior with a mobility of similar to 10(-3)cm(2)/V.s and an on-off ratio of 10(4), while no switching behavior was observed in FETs based on 5B active layers. The lower highest occupied molecular orbital (HOMO) of 5B than that of 5A in the quantum-chemical calculation might explain these FET behaviors. Thus, HOMO, lowest unoccupied molecular orbital (LUMO) levels and FET actions of the co-oligomer molecules that consist of the same amount of building blocks can be controlled by the sequence of electron-donating and electron-withdrawing building blocks. (C) 2012 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE SA
Thin Solid Films, 2012年, ［査読有り］

Preparation of dibromopyridines having -(CH2)m-SO3Na group(s) as monomers for new polypyridines
Takei; T.; Ohki; T.; Harada; Y.; Kumagai; N.; Fukumoto; H.; Koizumi; T.; Maeda; A.; Kojima; T.; Sei; Y.; Shiramizu; K.; Abe; M.; Oota; M.; Yamamoto; T., Dibromopyridines or dibromopyridone with -(CH2)(m)-SO3Na group(s) has been prepared via the reactions of the corresponding dibromopyridines with -OH and -NH2 groups with sultone. These compounds were converted into polymers with the -(CH2)(m)-SO3H groups via organometallic polycondensation. The polymer showed proton conducting properties and high stability toward oxidation. (C) 2012 Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
Tetrahedron Lett., 2012年, ［査読有り］

pi-Conjugated Polymers Consisting of 9,10-Dihydrophenanthrene Units
Takakazu Yamamoto; Ryouichi Tokimitsu; Takahiro Asao; Takayuki Iijima; Hiroki Fukumoto; Take-aki Koizumi; Takashi Fukuda; Hirobumi Ushijima, p-Conjugated polymers consisting of 9,10-disubstituted 9,10-dihydrophenenthrene, with the substituents octyl, 2-ethylhexyl, -OSiBu3, etc., units are prepared by organometallic polycondensation. Homopolymers (PH2Ph(9,10-R)) have a p-conjugation system similar to that of polymers of 9,9-dialkylfluorene and show UV-Vis peaks at 380 nm. In addition to the peak at 380 nm, some homopolymers give rise to a peak at a longer wavelength, suggesting molecular assembly of the polymers. X-ray diffraction data support the molecular assembly. The homopolymers show photoluminescence (PL) with PL peaks at 430 nm, and PL spectrum of the polymer film is essentially unchanged after heating the polymer film at 150 degrees C in air. The homopolymers undergo electrochemical p-doping at about 1.5 V versus Ag+/Ag., WILEY-V C H VERLAG GMBH
MACROMOLECULAR CHEMISTRY AND PHYSICS, 2011年11月, ［査読有り］

Preparation of Head-to-tail pi-Conjugated Poly(thiophene-pyridine) and Poly(pyrimidine) by Organometallic Polycondensation
Fukumoto; H.; Fujiwara; Y.; Yamamoto; T., The metalation of Br-ThPy-Br (Th: thiophene-2,5-diyl; Py: pyridine-2,5-diyl) and 2-iodo-5-bromopyrimidine with i-PrMgCl proceeds regioselectively. The cross-coupling polycondensation of regioselectively metalated intermediates gives head-to-tail pi-conjugated poly(thiophene-pyridine) and polypyrimidine, respectively, and their packing structures in the solid state and optical data are discussed., CHEMICAL SOC JAPAN
Chem. Lett., 2011年, ［査読有り］

Bithiophene-Bithiazole Alternating Copolymers with Thiophene Side Chains: Synthesis by Orgaonmetallic Polycondensation and Chemical Properties of the Copolymers
Yamamoto; T; Otsuka; S.-i.; Fukumoto; H.; Sakai; Y.; Aramaki; S.; Fukuda; T.; Emoto; A.; Ushijima; H., WILEY-BLACKWELL
J. Polym. Sci. Part A: Polym. Chem., 2011年, ［査読有り］

pai-Conjugated Poly(aryleneethynylene)s Consisting of Salophen and Ni-Salophen Units in the pai-Conjugated Main Chain: Preparation and Chemical Properties
Fukumoto; H.; Yamane; K.; Kase; Y.; Yamamoto; T., pi-Conjugated poly(aryleneethynylene)s consisting of N,N'-bis(salicylidene)-1,2-phenylenediamine (salophen) units (Poly-1-Poly-3) and salophen nickel complex units (Poly-1-Ni) were prepared in high yields by the palladium-catalyzed polycondensation of H--Ar--H (Ar = fluorene or 2,5-dialkoxy-p phenylene) with dibromo compounds of salophen (Br(2)-Salophen) and its nickel complex (Br(2)-Salophen-Ni), respectively The Ni free polymers (Poly-1-Poly-3) showed good solubility in CHCl(3) and THF, had high thermal stability, and exhibited number average molecular weights (M(n)) of 9200-14000 in GPC analysis The UV-vis spectra of the polymers showed pi-pi* transition peaks at about 420 nm which was comparable to those of poly(p-phenyleneethynylene)s The UV-vis spectrum of Poly-1-Ni exhibited additional intermediate and small peaks at about 480 and 600 nm, which were assigned to a charge transfer (CT) electronic transition and a d-d transition, respectively The complexation of Poly-1 with Ni(2+) proceeded clearly and quantitatively to give Poly-1-Ni, as monitored by UV-vis spectroscopy Both the NI-free and Ni containing polymers were electrochemically active and CV (cyclic volammetry) scans of the polymers showed a reduction peak of the salophene unit at approximately -2 2 V vs Ag(+)/Ag and an oxidation peak of the salophene unit at about 0 8 V vs Ag(+)/Ag, AMER CHEMICAL SOC
Macromolecules, 2010年, ［査読有り］

Molecular Beam Deposition of Nanoscale Ionic Liquids in Ultrahigh Vacuum
Maruyama; S.; Takeyama; Y.; Taniguchi; H.; Fukumoto; H.; Itoh; M.; Kumigashira; H.; Oshima; M.; Yamamoto; T.; Matsumoto; Y., We propose a new approach to nanoscience and technology for ionic liquids (ILs): molecular beam deposition of IL in ultrahigh vacuum by using a continuous wave infrared (CW-IR) laser deposition technique. This approach has made it possible to prepare a variety of "nano-IL" with the given composition on the substrate: a nanodroplet, on one hand, the volume of which goes down to 1 aL and, on the other hand, an ultrathin film with a thickness to several 100 nm or less. The result of fractional distillation of a binary mixture of ILs, investigated by nuclear magnetic resonance as well as electrospray ionization time-of-flight mass spectrometry, indicates that this deposition process is based on the thermal evaporation of ILs, and thus this process also can be used as a new purification method of ILs in vacuum. Furthermore, the fabrication of binary mixture droplets of two ILs on the substrate by alternating deposition of two HA was demonstrated; the homogeneity of the composition was confirmed even for one single droplet by high-spatial-resolution Raman spectroscopy., AMER CHEMICAL SOC
ACS nano, 2010年, ［査読有り］

Synthesis of New Thiophene-Based -Conjugated Organic Compounds and Polymer
Usui, M; Fukumoto, H; Yamamoto, T, p-Dibromobcnzenes and p-phenylenediboronate with pi-conjugated bithiophene and terthiophene arms were synthesized. They showed UV-vis absorption peaks in the range of 376-417 nm. p-Phenylenediboronate with bithiophene arms were used for synthesis of a new pi-conjugated polymer consisting of isothianaphthene and the p-phenylene units with pi-conjugated bithiophene side chains., CHEMICAL SOC JAPAN
Bull. Chem. Soc. Jpn., 2010年, ［査読有り］

π-Conjugated Polymers Consisting of Isothianaphthene and Dialkoxy-p-phenylene Units: Synthesis, Self-Assembly, and Chemical and Physical Properties
Yamamoto, T; Usui, M; Ootsuka, H; Iijima, T; Fukumoto, H; Sakai, Y; Aramaki, S; Yamamoto, H. M; Yagi, T; Tajima, H; Okada, T; Fukuda, T; Emoto, A; Ushijima, H; Hasegawa, M; Ohtsu H, A series of pi-conjugated alternating copolymers consisting of Th-ITN-Th and p-C(6)H(2)(OR)(2) units were synthesized. XRD indicated that the copolymers assume an interdigitation packing mode, and UV-Vis spectra revealed a strong tendency for self-assembly. Upon molecular assembly of the copolymer, the UV-Vis absorption shifted by about 100 nm to a longer wavelength from that of the single molecule. The copolymers underwent electrochemical oxidation (or p-doping) and reduction (or n-doping) at 0.2 and -2.0 V versus Ag(+)/Ag, respectively. A p-doped copolymer film showed an electrical conductivity of 182 S.cm(-1), and the temperature dependence of electrical conductivity was measured. The copolymer showed piezochromism and served as a p-channel material for a field-effect transistor., WILEY-BLACKWELL
Macromol. Chem. Phys., 2010年, ［査読有り］

Ionic polymers and oligomers with expanded -conjugation system derived from through-space interaction in piperazinium ring
Yamaguchi, I; Kado, A; Fukuda, T; Fukumoto, H; Yamamoto, T; Sato, M, Reactions of N-(2,4-dinitrophenyI)-4-arylpyridinium chlorides (aryl (Ar) = phenyl and 4-pyridyl) with piperazines caused the ring opening of the pyridinium ring and yielded polymers that consisted of 5-piperazinium-3-aryl-penta-2,4-dienylideneammonium chloride units [-N(CH(R)CH2)(2)N+(Cl-)=CH CH=C(Ar)-CH=CH-, R=H, Me, and phenyl]. However, the same reactions occurring in the presence of piperidine yielded oligomers that consisted of 5-piperazinium-3-aryl-penta-2,4-dienylideneammonium chloride units having piperidine and/or piperazine rings at both ends. H-1 NMR spectra suggested that pi-electrons of the penta-2,4-dienylideneammonium group of the polymers and the oligomers were delocalized. UV-vis measurements revealed that the it-conjugation system expanded along the polymer and oligomer chains due to the orbital interaction between electrons on the two nitrogen atoms of the piperazinium ring. Conversion of the piperazinium ring from the boat form to the chair form caused decrease in the it-conjugation length. The rate constants of the conversion of the oligomers depended on their chain lengths. The surface of pellets that were molded from the polymers and oligomers exhibited metallic luster. These polymers and oligomers underwent electrochemical oxidation in solution. (C) 2010 Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
Eur. Polym. J., 2010年, ［査読有り］

Highly Coplanar Polythiophenes with -C(≡)CR Side Chains: Self-assembly, Linear and Nonlinear Optical Properties, and Piezochromism
Yamamoto, T; Sato, T; Iijima, T; Abe, M; Fukumoto, H; Koizumi, T; Usui, M; Nakamura, Y; Yagi, T; Tajima, H; Okada, T; Sasaki, S; Kishida, H; Nakamura, A; Fukuda, T; Emoto, A; Ushijima, H; Kurosaki, C; Hirota, H, Self-assembly of polythiophenes with -C CR (R = alkyl, phenyl, etc.) side chains has been investigated. Seven new polymers consisting of head-to-head and tail-to-tail 2,2'-bithiophenes with -C CR side chains were synthesized. The new polymers include alternating copolymers between bithiophenes with -C C-alkyl side chains and thiophene and those between bithiophenes with -C C-alkyl side chains and 2,2'-bithiophene. The polythiophene main chain is considered to be coplanar because of the absence of steric repulsion between the main chain and the -C CR side chain. Single-crystal X-ray crystallography and DFT calculations indicated that the head-to-head- and tail-to-tail-2,2'-bithiophenes with -C CR side chains were coplanar. The polythiophenes with -C CR side chains showed a strong tendency to self-assemble, and assumed edge-on alignment and side-on alignment on the surface of substrates. Self-assembly caused a decrease in the pi-pi* transition energy of the polymers by 0.3-0.4eV. A copolymer of thiophene and dialkoxy-p-phenylene showed analogous self-assembly. The polythiophenes with -C CR side chains showed piezochromism, with a decrease in the pi-pi* transition energy by about 0.2eV at 10GPa. Head-to-head-P3(C C-Dec)Th with a -C C-decyl side chain gave a larger optical third-order nonlinear susceptibility chi((3)) than regio-regular poly(3-hexylthiophene)s., CHEMICAL SOC JAPAN
Bull. Chem. Soc. Jpn., 2009年07月, ［査読有り］

Preparation of Head-to-Head Type Substituted Polyacetylenes by Organometallic Polycondensation
Takakazu Yamamoto; Kenichiro Ohya; Kazuaki Kobayashi; Ken Okamoto; Syusaku Koie; Hiroki Fukumoto; Take-aki Koizumi; Isao Yamaguchi, AMER CHEMICAL SOC
MACROMOLECULES, 2009年04月, ［査読有り］

Time-resolved photoluminescence study and microcapillary laser of blue-emissive pai-conjugated polymers based on 9,10-dihydrophenanthrene unit
Masuyama; K.; Yamasaki; N.; Fujii; A.; Asao; T.; Fukumoto; H.; Yamamoto; T.; Hidayat; R.; Ozaki; M., The emission properties of pi-conjugated polymers based on 9,,10-dihydrophenanthrene units, which are expected to form linear and planar pi-conjugations and have rigid characteristics in the main chain, have been clarified in the films. The photoluminescence decay of the pi-conjugated polymers with the 9,10-dihydrophenanthrene unit has been studied in detail, and low-threshold photopumped multimode blue laser emission has been demonstrated from cylindrical microcavities with the polymer thin film fabricated onto the inner surface of an optical capillary tube. (C) 2009 The Japan Society of Applied Physics, JAPAN SOC APPLIED PHYSICS
Jpn. J. Appl. Phys., 2009年, ［査読有り］

pai-Conjugated poly(pyrimido[5,4-d]pyrimidine-2,6-diyl)s with two different alkylamino groups: synthesis, chemical properties, and structure
Fukumoto; H.; Takatsuki; S.; Lee; B.-L.; Yamamoto; T., New pi-conjugated pyrimidopyrimidine polymers with two different alkylamino groups at C4 and C8 positions, PPympym(4-NH-n-C(8)H(17)-8-NHR) (R = n-C(4)H(9), n-C(6)H(13), n-C(12)H(25), and n-C(16)H(33)), were prepared by dehalogenation polycondensation using nickel zerovalent complex in high yield. The obtained polymers were partly soluble in organic solvents such as chloroform. A chloroform soluble part of PPympym(4-NH-n-C(8)H(17)-8-NH-n-C(16)H(33)) showed a number-average molecular weight of about 3,000 in GPC analysis. UV-vis spectra of the polymers in CHCl(3) showed a pi-pi absorption peak at about 450 run, and the peak position shifted by 30 nm to a longer wavelength in film. The polymers showed photoluminescence both in solution and in film. Cast films of the polymers were electrochemically reduced at about -2.3 V vs. Ag(+)/Ag. XRD patterns of the polymers revealed the polymers took an end-to-end packed structure. (C) 2009 Elsevier B.V. All rights reserved, ELSEVIER SCIENCE SA
Synth. Met., 2009年, ［査読有り］

DIBROMIDES OF BOC-PROTECTED 1-AMINOPYRROLE AND 4-AMINO-1,2,4-TRIAZOLE: SYNTHESIS, X-RAY MOLECULAR STRUCTURE, AND NMR BEHAVIOR
Takakazu Yamamoto; Gentaro Tanaka; Hiroki Fukumoto; Take-aki Koizumi, alpha-Dibromides of BOC-protected 1-aminopyrrole and 4-amino-1,2,4-triazole have been prepared and their molecular structures have been confirmed by X-ray crystallography. They can be used for polymer synthesis., PERGAMON-ELSEVIER SCIENCE LTD
HETEROCYCLES, 2009年01月

Optical properties and microcapillary laser of blue-emissive pi-conjugated polymers based on 9,10-dihydrophenanthrene unit
Kimihiro Masuyama; Akihiko Fujii; Takashi Nakao; Takahiro Asao; Hiroki Fukumoto; Takakazu Yamamoto; Jun Sakai; Rahmat Hidayat; Masanori Ozaki, The optical properties of pi-conjugated polymers based on 9,10-dihydrophenanthrene units, such as optical absorption and photoluminescence (PL), were studied. The electronic energy structures were determined by optical measurements. Strong PL with high quantum efficiency was clarified in the films, and photo-pumped multimode blue laser emission was demonstrated from cylindrical microcavities with the polymer thin film fabricated inside the optical capillary tube., JAPAN SOCIETY APPLIED PHYSICS
JAPANESE JOURNAL OF APPLIED PHYSICS, 2008年06月, ［査読有り］

Preparation and Chemical Properties of Soluble -Conjugated Poly(aryleneethynylene) Consisting of Azabenzothiadiazole as the Electron-Accepting Unit
Fukumoto, H; Yamamoto, T, A soluble charge-transfer type poly(aryleneethynylene), PAE-AzaBzTdz, consisting of a highly electron-accepting azabenzothiadiazole unit was prepared in 99% yield by palladium-catalyzed polycondensation between 4,7-dibromo-2,1,3-azabenzothiadiazole (Br2-AzaBzTdz) and 1,4-diethynyl-2,5-didodecyloxybenzene. PAEAzaBzTdz showed a number-average molecular weight, M, of 6000 in gel-permeation chromatography analysis and had good thermal stability as measured by TGA. UV-vis spectrum of PAE-AzaBzTdz exhibited an absorption peak at 529 nm in chloroform, and the absorption peak shifted to a longer wavelength (601 nm) in film. Addition of MeOH to a CHCl3 solution of PAE-AzaBzTdz led to aggregation of the polymer to form stable colloidal particles. Results of filtration experiments using 0.2 and 0.02 mu m membranes supported aggregation of the polymer. Addition of trifluoroacetic acid (TFA) to a chloroform solution of PAE-AzaBzTdz led to a red-shift of the UV-vis peak from 529 to 640 nm. An X-ray diffraction pattern of powdery PAEAzaBzTdz indicated that the polymer assumed a layer-to-layer stacked structure with an interlayer distance of 3.4 A in the solid state. An X-ray diffraction pattern of cast film of PAE-AzaBzTdz revealed that the polymer molecules in the cast film were ordered on the surface of Pt plate with the dodecyl side chain oriented toward the surface of the Pt plate. (C) 2008 Wiley Periodicals, Inc., JOHN WILEY & SONS INC
J. Polym. Sci. Part A: Polym. Chem., 2008年05月, ［査読有り］

Electrochemical and chemical doping behavior of bithiophene-bithiazole copolymer
Syun-ichi Otsuka; Hiroki Fukumoto; Takakazu Yamamoto, An alternating copolymer of 4,4'-dialkyl-2,2'-bithiazole (alkyl = tridecyl) and 2,2'-bithiophene receives electro-chemical p-doping and n-doping with a peak current anode potential (E-pa) and a peak cur-rent cathode potential (E-pc) of 0.69 and -2.13 V vs. Ag+/Ag, respectively. The copolymer undergoes chemical p-doping with NOBF4. X-ray diffraction (XRD) data of the p-doped copolymer indicate that the pi-stacking distance of the copolymer is shortened from 3.62 to 3.52 angstrom after the p-doping. Location of the BF4- dopant in the p-doped copolymer is discussed., CHEMICAL SOC JAPAN
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 2008年04月

Chemical and electrochemical oxidation of thiophene-pyridine and thiophene-pyrimidine co-oligomers in solutions
Akira Kumagai; Hiroki Fukumoto; Takakazu Yamamoto, Chemical and electrochemical oxidation (or p-doping) of three types of pi-conjugated co-oligomers, Py-Th-(Th)(n)-Th-Py (Py = pyridine unit; Th = thiophene unit; 5a, n = 1; 6a, n = 2), Th-Py-(Th)(n)-Py-Th (5b: n = 1; 6b: n = 2), and Pym-Th-(Th)(n)-Th-Pym (Pym = pyrimidine unit; 5c: n = 1; 6c: n = 2), in solution systems has been studied. The chemical oxidation with NOBF4 proceeded with isosbestic points in the UV-vis spectrum. The UV-vis absorption peak of 5a at 418 nm in CH2Cl2 shifted to 456 nm after oxidation of 5a with NOBF4. The oxidized 5a was easily reduced by N2H4 to give the original UV-vis spectrum of 5a, and 5b, 6b, and 5c behaved similarly in the oxidation and reduction. In the oxidation by NOBF4, an (oxidized co-oligomer)/(original neutral co-oligomer) ratio of 1 was attained at [NOBF4] = 1.3 x 10(-6), 4 x 10(-6), 7 x 10(-6), and 9 x 10(-6) M for 5a, 6b, 5b, and 5c, respectively. The obtained data are considered to reflect the ease of oxidation of the co-oligomer, which is affected by the electron-accepting nature of the N-containing aromatic unit in the co-oligomer and effective pi-conjugated length of the co-oligomer. The cyclic voltammogram of 5a showed three redox couples with anodic peak current potentials of E-pa = 0.75, 1.10, and 1.34 V versus Ag+/Ag, respectively. The first oxidation peak was assigned to one-electron oxidation of 5a, and electronic current of the first anodic peak (i) of 5a and 5c was proportional to (scanning rate)(1/2). From the i- (scanning rate)(1/2) relationship, diffusion constants, D's, of 5a and 5c were estimated to be 9.6 x 10(-6) and 1.7 x 10(-5) cm(2) s(-1), respectively. CV data of 5b with the terminal thiophene units indicated occurrence of electrochemical oxidative polymerization of 5b., AMER CHEMICAL SOC
JOURNAL OF PHYSICAL CHEMISTRY B, 2007年07月

pi-Conjugated alpha,omega-diphenylpolyene complexes of RuClCp* fragment(s) in eta(4)-s-cis conformation
Hiroki Fukumoto; Kazushi Mashima, pi-Conjugated polyene complexes of the general formula (RuClCp*)(n)(polyene) [2: n = 1, polyene = 1,4-diphenylbuta1,3-diene; 3: n = 1, polyene = 1,6-diphenylhexa-1,3,5-triene; 4: n = 2, polyene = 1,8-diphenylocta-1,3,5,7-tetraene; 5: n = 2, polyene = 1,10-diphenyldeca-1,3,5,7,9-pentaene; 6: n = 3, polyene = 1,12-diphenyldodeca-1,3,5,7,9,11-hexaene], in which each ruthenium(II) atom has Cp* (Cp* = eta(5)-C5Me5) and chlorido ligands, were prepared by treating [Ru(mu 3-Cl)- CP*](4) (1) with the corresponding alpha,omega-diphenylpolyenes. All diene units of the complexes were fully metalated by the coordination of "RuClCp*" fragments in an eta(4)-s-cis conformation. (c) Wiley-VCH Verlag GmbH & Co., WILEY-V C H VERLAG GMBH
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, 2006年12月, ［査読有り］

Alternating copolymer of bithiophene and dialkylbithiazole and its tendency to align on the surfaces
Takakazu Yamamoto; Syun-ichi Otsuka; Kimiyasu Namekawa; Hiroki Fukumoto; Isao Yamaguchi; Takashi Fukuda; Naoki Asakawa; Takeshi Yamanobe; Takeshi Shiono; Zhengguo Cai, New five-membered ring pi-conjugated polymers composed of 2,2'-bithiophene and 4,4'-dialkyl-2,2'-bithiazole units were prepared. The polymers were soluble in 1,2-dichlorobenzene and showed a UV-vis peak at about 490 nm above 120 degrees C. Cooling the solution led to the appearance of new UV-vis peaks at 550 and 600 nm, which were considered to originate from self-assembled polymer molecules. Powder XRD (X-ray diffraction) data supported a well-stacked solid structure of the polymers and a highly ordered structure of a polymer film formed on a quartz glass substrate. These data revealed a strong tendency of the new polymers to self-assemble and to form an aligned structure on the surface of the substrates. (c) 2006 Elsevier Ltd. All rights reserved., ELSEVIER SCI LTD
POLYMER, 2006年08月

Synthesis and basic optical properties of new pi-conjugated thiophene-pyridine co-oligomers
Hiroki Fukumoto; Akira Kumagai; Yoshiki Fujiwara; Hideomi Koinuma; Takakazu Yamamoto, Two series of pi-conjugated thiophene-pyridine co-oligomers, Py-Th-(Th)(m)-Th-Py (Py = pyridine unit; Th = thiophene unit; 4a: m = 0; 5a: m = 1; 6a: m = 2) and Th-Py-(Th)(m)-Py-Th (4b: m = 0; 5b: m = 1; 6b: m = 2), have been prepared by palladium- or nickel-promoted C-C coupling reaction in high yields. The pi-pi* absorption peak of Py-Th-(Th)m-Th-Py (390-440 mn) is observed at a longer wavelength than that of Th-Py-(Th)m-Py-Th (345-410 mn) with the same m number. These UV-vis data are considered to reflect a charge transfer (CT) interaction between the thiophene (donor) and pyridine (acceptor) units. 4a-6a, 5b, and 6b show photoluminescence in a range of 430-540 mn and give quantum yields (0) of 20-40%. 4b affords a high quantum yield of Phi = 71%. A linear correlation holds between the pi-pi* transition energy and the inverse of the number of the aromatic units [1/(m+4)] for the 4a-6a and 4b-6b series., PERGAMON-ELSEVIER SCIENCE LTD
HETEROCYCLES, 2006年07月, ［査読有り］

New heteroaromatic polymers consisting of alkyl- and amino-1,3,5-triazine units. Their basic optical properties and n-type time-of-flight drift mobility
T Yamamoto; S Watanabe; H Fukumoto; M Sato; T Tanaka, Alternating copolymers between substituted 1,3,5-triazine (substituent = alkyl or amine) and thiophene or bithiophene are synthesized. The copolymer of amino-1,3,5-triazine with thiophene is soluble in organic solvents, transparent in most parts of the visible region, and photoluminescent. The copolymer receives electrochemical n-doping with an E-pc of -2.08 V vs Ag+/Ag and shows a time-of-flight electron drift mobility of 2.0 x 10(-4) cm(2) center dot V-1 center dot s(-1) which is larger than that of widely used Al(8-quinolinolato)(3)., WILEY-V C H VERLAG GMBH
MACROMOLECULAR RAPID COMMUNICATIONS, 2006年03月, ［査読有り］

Molecular alignments studied by X-ray diffraction analysis and optical properties of vacuum-deposited thin films of thiophene-pyridine co-oligomers
Kumagai; A.; Fujiwara; Y.; Fukumoto; H.; Sasaki; S.; Koinuma; H.; Yamamoto; T., An X-ray diffraction study of vacuum-deposited films of thiophene-pyridine co-oligomers on a sapphire substrate indicated a perpendicular or perpendicular-like alignment of the co-oligomers on the surface of the substrate. The UV-vis peak of the vacuum-deposited films shifted to a shorter wavelength from that observed in solutions. The UV-vis data support the notion that the co-oligomer in the vacuum-deposited film assumes a twisted conformation., INST PURE APPLIED PHYSICS
Jpn. J. Appl. Phys., 2006年, ［査読有り］

Luminescent palladium complexes containing thioamide-based SCS pincer ligands
M Akaiwa; T Kanbara; H Fukumoto; T Yamamoto, Thioamide-based tridentate ligands, 1,3-benzenedicarbothioamides (1a-c), were used to afford pincer palladium(II) complexes (Pd(1-H)Cl, 2a-c) with eta(3)-S,C,S type coordination. The complexes exhibit strong emission in a glassy frozen state as well as in the solid state. The decay lifetime of the emission from the complexes is in a range of 8-9 x 10(-5) s, which is indicative of phosphorescent emission. (c) 2005 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE SA
JOURNAL OF ORGANOMETALLIC CHEMISTRY, 2005年09月, ［査読有り］

Unique preferential conformation and movement of Ru(acac)(2) fragment(s) coordinated in an eta(4)-s-trans fashion to all diene unit(s) of alpha,omega-diphenylpolyenes
H Fukumoto; K Mashima, alpha,omega-Diphenylpolyene complexes bearing bis(acetylacetonato)ruthenium(II) of the general formula Ru-n(acac)(2n)(polyene) [1: n = 1, polyene = 1,4-diphenylbuta-1,3-diene; 2: n = 1, polyene = 1,6-diphenylhexa-1,3,5-triene; 3: n = 2, polyene = 1,8-diphenylocta-1,3,5,7-tetraene; 4 and 6: n = 2, polyene = 1,10-diphenyldeca-1,3,5,7,9-pentaene; 5: n = 3, polyene = 1,12-diphenyldodeca-1,3,5,7,9,11-hexaene] were prepared by reaction of Ru(acac)(3) with the corresponding polyene in the presence of excess amounts of zinc dust. The Ru(acac)(2) fragments in 1-6 coordinated in an eta(4)-s-trans fashion to each diene unit of the polyene ligands. The Delta-Ru(acac)(2) unit and its enantiomer Delta-Ru(acac)(2) were assigned to coordinate to the re-face and the si-face of the diene unit, respectively, on the basis of the crystal structure of complexes 1 and 2 together with the previously reported 3. Hexaene complex 5 was assumed to have the structure anti, anti-Delta,Lambda,Delta-5a, and its enantiomer, anti, anti-Delta,Lambda,Delta-5b. Pentaene complex 4, in which two Ru(acac)(2) fragments were bound to C(1)-C(4) and C(7)-C(10) of the pentaene ligand, was isolated. The Ru(acac)2 fragment of 4 moved over the pentaene in CHCl3 to settle in the thermodynamically stable 6, in which two ruthenium fragments are located at adjacent positions. The metal migration process, as monitored by the decrease of 4, was found to be of first-order for 4, giving the activation parameter Delta G(double dagger)(25 degrees C) = 15.8 +/- 0.2 kcal/mol., AMER CHEMICAL SOC
ORGANOMETALLICS, 2005年08月, ［査読有り］

Synthesis of 3-alkynyl-2,5-dibromothiophene and 3,3 '-dialkynyl-5,5 '-dibromo-2,2 '-bithiophene as the starting compounds for pi-conjugated polymer
T Sato; H Kokubo; H Fukumoto; T Yamamoto, 3-Alkynyl-2,5-dibromothiophene 2 and 3,3'-dialkynyl-5,5'-dibromo-2,2'-bithiophene have been prepared. Pd-catalyzed polycondensation between 2 and 2,2'-p-[2,5-bis(dodecyloxy)-1,4-phenylene]bis(5,5-dimethyl-1,3,2-dioxaborinane) gave a novel soluble red pi-conjugated polymer., CHEMICAL SOC JAPAN
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 2005年07月, ［査読有り］

Regioregular head-to-tail poly(6-alkylpyridine-2,5-diyl)s and a new type of packing structure of the polymer in the solid state
H Fukumoto; R Kimura; S Sasaki; K Kubota; T Yamamoto, New regioregular head-to-tail type poly(6-alkylpyridine-2,5-diyl)s (P6RPys; R = nonyl, dodecyl, and pentadecyl) were prepared by organometallic polycondensation. The head-to-tail (HT) content in the polymers was higher than 95%, as revealed by H-1 NMR spectroscopy. Powder X-ray diffraction data of HT-P6RPys indicated that P6RPys formed a new type of structure composed of an alternating end-to-end packed unit and an interdigitation packed unit. (C) 2004 Wiley Periodicals, Inc., JOHN WILEY & SONS INC
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 2005年01月, ［査読有り］

Synthesis of soluble poly(9,10-dihydrophenanthrene-2,7-diyl)s. A new class of luminescent poly(p-phenylene)s with ethylene type bridges
T Yamamoto; T Asao; H Fukumoto, Poly(9,10-dihydrophenanthrene-2,7-diyl)s with -OSi(R)(2)(R') groups at the 9,10-positions were synthesized by dehalogenative polycondensation of the corresponding monomers by using a zerovalent nickel complex. They showed number average molecular weights (M-n's) of 9800-69,000 and high quantum yields (62%-quantitative) in photolummescence. Palladium catalyzed copolymerization of 2,7dibromo-9,10-dihydrophenanthrene having -OCH3 or -OSi(R)(2)(R') groups at the 9,10-positions with diethynyl- or diboronic-aromatic compounds also gave photoluminescent polymers with high quantum yields. (C) 2004 Elsevier Ltd. All rights reserved., ELSEVIER SCI LTD
POLYMER, 2004年11月, ［査読有り］

Chain distortion of m-linked aromatic polymers: poly(m-phenylene) and poly(m-pyridine)
N Kobayashi; S Sasaki; M Abe; S Watanabe; H Fukumoto; T Yamamoto, The crystal structures of poly(m-phenylene) (PMP) and poly(m-pyridine) [poly(pyridine-2,6-diyl)] (PMPy) have been analyzed by the linked-atom Rietveld method for X-ray powder diffraction profiles in order to demonstrate the effect of hydrogen repulsion on the planarity of aromatic polymer chains. Chain conformation of PMP is a slowly winding helix with a five-ring structural repeat, in which the neighboring aromatic rings are rotated owing to the hydrogen repulsion by torsion angles of average value 42degrees, in contrast to the alternately twisted conformation of poly(p-phenylene). The four helices are packed in a tetragonal unit cell with dimensions a = b = 13.45 Angstrom and c = 11.30 Angstrom (space group: P4(1)2(1)2 or P4(3)2(1)2), and they engage with one another. The helical structure, isomorphous to that of m-deciphenyl determined by single-crystal X-ray analysis, is stabilized by the interchain interactions. The PMPy chain assumes the anticoplanar conformation relieved from hydrogen repulsion. The two chains are contained in an orthorhombic unit cell with dimensions a = 12.23 Angstrom, b = 3.92 Angstrom, and c = 7.06 Angstrom (space group: Pnam) in a manner similar to orthorhombic polyethylene., AMER CHEMICAL SOC
MACROMOLECULES, 2004年10月, ［査読有り］

Alkylation of 3,8-dibromo-1,10-phenanthroline and new pi-conjugated polymers, poly(2-alkyl-1,10-phenanthroline-3,8-diyl)s, derived from the alkylated monomers
T Yamamoto; K Anzai; T Iijima; H Fukumoto, AMER CHEMICAL SOC
MACROMOLECULES, 2004年04月, ［査読有り］

Direct alkylation and phenylation of 3,8-dibromo-1,10-phenanthroline with Grignard reagents
K Anzai; H Fukumoto; T Yamamoto, Reactions of alkyl and phenyl Grignard reagents with 3,8-dibromo- 1,10-phenanthroline led to alkylation and phenylation at the 2-position of 1,10-phenanthroline. The prepared 2-alkyl-1,10-phenanthroline forms a 1:1 complex with Cu(II) and serves as a starting material for poly(2-alkyl-1,10-phenanthroline-3,8-diyl)., CHEMICAL SOC JAPAN
CHEMISTRY LETTERS, 2004年03月, ［査読有り］

The first observation of 1H-NMR spectrum of pentacene
Nagano; M.; Hasegawa; T.; Myoujin; N.; Yamaguchi; J.; Itaka; K.; Fukumoto; H.; Yamamoto; T.; Koinuma; H., Despite much interest in pentacene as a promising organic semiconductors, its chemical properties have scarcely been elucidated. Even such a fundamental data as H-1-NMR spectrum has not been reported yet due to poor solubility of pentacene in various solvents. Here we report the first observation of H-1 NMR spectrum of pentacene by using dimethyl sulfoxide-d(6) as solvent and heating the sample to 80degreesC. Not only the signal assignment but also the easily oxidizable property of pentacene was verified from the comparison between the spectra measured in degassed and non-degassed solvents., INST PURE APPLIED PHYSICS
Jpn. J. Appl. Phys., 2004年, ［査読有り］

Poly(1,10-phenanthroline-3,8-diyl) and its derivatives. Preparation, optical and electrochemical properties, solid structure, and their metal complexes
T Yamamoto; Y Saitoh; K Anzai; H Fukumoto; T Yasuda; Y Fujiwara; BK Choi; K Kubota; T Miyamae, pi-Conjugated poly(1,10-phenanthroline-3,8-diyl), PPhen, and its 5,6-dialkoxy derivatives, PPhen(5,6-OR)s, have been synthesized by using an organometallic polycondensation with a zerovalent nickel complex. They had average molecular weights of 4300-6800. PPhen had a stiff structure, as revealed by a light scattering method, and exhibited a strong dichroism in UV-vis absorption and photoluminescence. PPhen(5,6-OR)s formed an end-to-end packing assembly assisted by the side chain crystallization of the OR groups. PPhen and PPhen(5,6-OR)s were susceptible to chemical and electrochemical reduction, and the reduced state showed certain stability toward oxygen in air. The pi-conjugated polymers underwent quantitative complex formation with [Ru(bpy)(2)](2+). Introduction of two more imine nitrogens in the repeating unit of PPhen enhanced much the electron accepting property of PPhen, and n-doping of the obtained polymer took place at E-pc of -1.38 V vs Ag+/Ag., AMER CHEMICAL SOC
MACROMOLECULES, 2003年09月, ［査読有り］

p-Doping behaviour of water-soluble pi-conjugated poly[3-(3 '-sulfopropyl)thiophene] Kinetic and spectroscopic studies
T Yamamoto; M Sakamaki; H Fukumoto, p-Doping behaviour of water-soluble pi-conjugated poly[3-(3'-sulfopropyl)thiophene], P3(PrSO3H)Th, has been studied kinetically and spectroscopically. The neutral, undoped state of the polymer was stable in a pH region above 4. However, the polymer received oxidation (or p-doping) in acidic aqueous solutions in the presence of O-2 and H2O2. The p-doping of the polymer with O-2 is explained by the following equation: (CH2CH2CH2SO3H)Th (1a) + (1/4)O-2 --> (CH2CH2CH2SO3-)Th+ (1b) + (1/2)H2O; 1a represents the repeating unit of P3(PrSO3H)Th. The oxidation reaction with O-2 obeyed the psudo-first-order rate law, -d([1a] - [1a](eq))/dt = k(obs) ([1a] - [1a](eq)); [1a](eq) represents concentration of 1a at the equilibrium; k(obs) at 298 K was evaluated as 1.54 x 10(-5) s(-1) under air. Temperature dependence of k(obs) gave kinetic parameters of DeltaG(double dagger) = 43.4 kJ mol(-1), DeltaH(double dagger) = 31.4 kJ mol(-1), and DeltaS(double dagger) = -40.2 J mol(-1) K-1, respectively, at 298 K under air. k(obs) increased roughly linearly with the O-2 pressure, giving the second-order rate equation, -d([1a] - [1a](eq))/dt = k(1) ([1a] - [1a](eq))[O-2]. H2O2 caused very rapid p-doping of the polymer to give a highly oxidized state. (C) 2003 Elsevier Science B.V. All rights reserved., ELSEVIER SCIENCE SA
SYNTHETIC METALS, 2003年08月, ［査読有り］

Preparation of a new poly(p-phenylene) type polymer, poly(pyrazine-2,5-diyl), with a coplanar structure
T Yamamoto; Y Fujiwara; H Fukumoto; Y Nakamura; SY Koshihara; T Ishikawa, Poly(pyrazine-2,5-diyl), PPyrz, was prepared by organometallic dehalogenative polycondensation of 2,5-dibromopyrazine. PPyrz was soluble in conc. H2SO4 and showed an eta/c value of 0.45 dl g(-1). PPyrz exhibited the UV-vis peak at the longest wavelength (lambda(max) = 439 nm) among the poly(p-phenylene) type polymers. The polymer afforded a simple CP-MAS solid C-13 NMR pattern with peaks at delta 143.3 and 148.5. Microwave-assisted synthesis was effective. (C) 2003 Elsevier Science Ltd. All rights reserved., ELSEVIER SCI LTD
POLYMER, 2003年07月, ［査読有り］

Preparation of soluble pi-conjugated poly(5,6-dialkoxy-1,10-phenanthroline-3,8-diyl)s. Their stacking behavior and function as a pi-conjugated polymer ligand
T Yamamoto; K Anzai; H Fukumoto, Soluble pi-conjugated poly(dialkoxyphenanthroline)s were prepared by organometallic polycondensation using a Ni(0) complex. Stacking structure, optical and electrochemical properties, and Ru complex forming reactivity of the polymer have been revealed., CHEMICAL SOC JAPAN
CHEMISTRY LETTERS, 2002年08月, ［査読有り］

Synthesis and properties of transition metal complexes assembled by coordination to rigid pi-conjugated aryleneethynylene ligands
H Fukumoto; T Yamamoto, A new pi-conjugated aryleneethynylene compound with pyrimidine moieties, 2,5-bis(pyrimidine-5-yl-ethynyl)-1,4-didodecyloxybenzene (1), has been prepared using Sonogashira reaction. 1 reacts with Ag (OSO2CF3) to give a polymeric complex 2 in moderate yields., TAYLOR & FRANCIS LTD
MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 2002年, ［査読有り］

Preparation and properties of poly[ (2-alkylbenzimidazole)-alt-thiophene]s with long alkyl side chains
Nurulla, I; T Morikita; H Fukumoto; T Yamamoto, New alternative copolymers of thiophene and benzimidazole with alkyl side chains (alkyl = n-C5H11, n-C7H12, n-C10H21, n-C12H25, and n-C18H37) have been prepared. The polymerization by Stille coupling of 2-alkyl-4,7-dibromobenzimidazoles with 2,5-bis(trimethylstannyl)thiophene gave the corresponding copolymers in good yields. The new copolymers showed absorption and photoluminescence peaks at about 436-460 and 520-530 nm, respectively. Quantum yields of the photoluminescence were about 21-37% in DMF. Addition of NaOH led to a red-shift of the absorption peak by about 60 nm. Their XRD patterns showed a diffraction peak in a low angle region (Bragg spacing d(1) = 17.4-35.4 Angstrom) and a broad peak at about d(2) = 4.0 Angstrom. Plots of the d(1) space vs. the number of carbon atom in the alkyl side chain gave a linear line with a slope of 1.35 Angstrom per carbon, suggesting an end-to-end type packing of the copolymer in the solid., WILEY-V C H VERLAG GMBH
MACROMOLECULAR CHEMISTRY AND PHYSICS, 2001年08月, ［査読有り］

Preparation and characterization of regioregular head-to-tail pi-conjugated poly(pyridine-2,5-diyl)s
T Yamamoto; T Nakamura; H Fukumoto; K Kubota, Regioregular head-to-tail pi -conjugated polypyridines have been prepared for the first time by organometallic polycondensation using Ni(II) complexes as the catalyst. The proportion of the MT-content in poly(6-hexylpyridine-2,5-diyl) was higher than 95%., CHEMICAL SOC JAPAN
CHEMISTRY LETTERS, 2001年06月

Synthesis and characterization of new pi-conjugated polymer complexes with transition metal fragments
H Fukumoto; N Hayashida; T Maruyama; T Yamamoto, Poly(2,2'-bipyridine-5,5'-diyl) (PBpy) (1) and a polymer of 2,2'-bipyrimidine (PBpym) (2) afford polymer complexes (3) and (4) coordinated with [Ru(bpy)(2)](2+) fragments, respectively. The UV-vis spectrum of (4) in cone. H2SO4 is considerably different from 2 in cone. H2SO4 The poly(6,6-dimethylbipyridine-5,5'-diyl)(P6MeBpy) (5) reacts with a ruthenium complex, [RuClCp*](4), (Cp* = pentamethylcyclopentadienyl) to give a new ruthenium complex (6)., GORDON BREACH SCI PUBL LTD
MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 2000年, ［査読有り］

Energy gap dependence of the S2 → S1 internal conversion of , -diphenylpolyenes (n = 3-8) in solution phase
Hirata, Y; Mashima, K; Fukumoto, H; Tani, K; Okada, T, By using femtosecond and picosecond transient absorption measurement techniques, we have investigated the dynamic behavior of the S-2 State of all-trans-alpha, omega-diphenylpolyenes, from diphenylhexatriene (N = 3) to diphenylhexadecaoctaene (N = 8), in solution. The St state lifetimes, which were determined from the decay of the S-2 <-- S-2 absorption band around 700 nm, were similar for N = 3-7. The observed small energy gap dependence of the S-2 --> S-1 internal conversion rate can be an indication of the large difference in the molecular geometry of the S-1 and S-2 states. (C) 1999 Published by Elsevier Science B.V. All rights reserved., ELSEVIER SCIENCE BV
Chem. Phys. Lett., 1999年07月, ［査読有り］

Polymerization of acrylonitrile catalyzed by thiolate complexes of divalent and trivalent lanthanoids
Y Nakayama; H Fukumoto; T Shibahara; A Nakamura; K Mashima, Arenethiolate complexes of lanthanoid(II) and lanthanoid(III) metals were used as initiators for the polymerization of acrylonitrile at -78 degrees C in THF, giving atactic and high molecular mass (M(n)approximate to 10(5)) polyacrylonitriles in good yield. (C) 1999 Society of Chemical Industry., JOHN WILEY & SONS LTD
POLYMER INTERNATIONAL, 1999年06月, ［査読有り］

Cationic monocyclooctatetraenyl-lanthanoid complexes derived from metallic lanthanoid: crystal structures of [Smh-C8H8)(hmpa)3]I and [Sm(h-C8H8)(hmpa)3][Sm(h-C8H8)2] (HMPA = hexamethylphosphoric triamide).
Mashima; K.; Fukumoto; H.; Nakayama; Y.; Tani; K.; Nakamura; A., Addition of an excess hexamethylphosphoric triamide (abbr. HMPA) to a neutral complex SmI(eta(8)-C8H8)(thf) (1) (C8H8 = 1,3,5,7-cyclooctatetraene), which was prepared by a direct reaction of metallic samarium with C8H8 in the presence of iodine in THF, afforded a cationic samarium complex [Sm(eta(8)-C8H8)(hmpa)(3)]I (2). Complex 2 can also be prepared by a simple one-pot reaction of stoichiometric amounts of metallic samarium, cyclooctatetraene, and iodine in the presence of an excess HMPA at 50 degrees C. With a catalytic amount of iodine, ionic complexes of general formula [Ln(eta(8)-C8H8)(hmpa)(n)][Ln(eta(8)-C8H8)(2)][Ln = La and n = 4 (6); Ln = Sm and n = 3 (7)] were obtained by treating metallic lanthanum or samarium, respectively, with cyclooctatetraene in the presence of HMPA. The structure of the diamagnetic complex 6 as well as the paramagnetic complexes 2 and 7 was determined by H-1 NMR spectroscopy. Crystal structures of 2 and 7 were revealed by X-ray analyses, indicating that these complexes comprised of a cationic [Sm(eta(8)-C8H8)(hmpa)(3)](+) and an anionic part; for 2 and 7 being I- and [Sm(eta(8)-C8H8)(2)](-), respectively. (C) 1998 Elsevier Science Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
Polyhedron, 1999年, ［査読有り］

1,8-Diphenylocta-1,3,5,7-tetraene Complexes of Ruthenium(II): Crystal Structures of [m-(s-cis-1,2,3,4-h:s-cis-5,6,7,8-h-PhCH=CHCH=CHCH=CHCH=CHPh)(RuClCp)2] and [-(s-trans-1,2,3,4-h:s-trans-5,6,7,8-h-PhCH=CHCH=CHCH=CHCH=CHPh){Ru(acac)2}2]
Mashima, K; Fukumoto, H; Tani, K; Haga, M; Nakamura, A, Reaction of 1,8-diphenyl-1,3,5,7-octatetraene with [Ru(mu Cl)Cp*](4) (1) (Cp* = eta(5)-pentamethylcyclopentadienyl) gave [mu(s-cis-1,2,3,4-eta:s-cis-5,6,7,8-eta-PhCH=CHCH-CHCH-CHCH-CHPh)(RuClCp*)(2)] (2), whose crystal structure revealed that 2 has a planar tetraene backbone coordinated by two Cp*RuCl moieties in s-cis-eta(4)-fashion; while the reaction with Ru(acac)(3)/Zn system resulted in the formation of [mu(s-trans-1,2,3,4-eta:s-trans-5,6,7,8-eta-PhCH=CHCH=CHCH=CHCH=CHPh){Ru(acac)(2)}(2)] (3), where both of the two Ru(acac)(2) moieties prefer s-trans coordination and thus the plane of the octatetraene backbone of 3 is deformed into an S-shape. Electrochemical studies for complexes 2 and 3 revealed that they have a coupling between the two ruthenium centers and are conjugatively interacted d pi-p pi organometallic systems., AMER CHEMICAL SOC
Organometallics, 1998年, ［査読有り］

Ligand exchange reactions of a 1,3-butadiene complex of magnesium
K Mashima; Y Matsuo; H Fukumoto; K Tani; H Yasuda; A Nakamura, The ligand exchange reaction of a diene ligand bound to magnesium was investigated. Reaction of the magnesium-butadiene compound [Mg(C(4)H(6))(thf)(2)](n) (2) with 1,4-diphenyl-1,3-butadiene afforded Mg(s-cis-1,4-diphenyl-1,3-butadiene)(thf)(3) (1) together with butadiene. Similarly, treatment of 2 with 1,6-diphenyl-1,3,5-hexatriene, anthracene, and 1,3,5,7-cyclooctatetraene afforded the corresponding magnesium adducts Mg(1,6-diphenyl-1,3,5-hexatriene)(thf)(3) (3), Mg(anthracene)(thf)(3) (4), and Mg(cot)(thf)(2.5) (5), respectively, in addition to the liberated butadiene. Reaction of 2 with diphenylacetylene in THF also induced the ligand exchange reaction, resulting in the formation of a diphenylacetylene adduct [Mg(PhC(2)Ph)(thf)](4) (6) of magnesium. (C) 1997 Elsevier Science S.A., ELSEVIER SCIENCE SA
JOURNAL OF ORGANOMETALLIC CHEMISTRY, 1997年10月, ［査読有り］

Thermochromism and dynamics of organometallic conjugated systems: Zirconocene complex of 1,4-diphenyl-1,3-butadiene
S Takeda; H Fukumoto; K Mashima; G Maruta; K Yamaguchi; A Nakamura, We observed the thermochromism of the deeply colored zirconocene complex of 1,4-diphenyl-1,3-butadiene (DPBD) in the solid state. Variable-temperature C-13-CP/MAS NMR spectroscopy revealed that a remarkable change of the electronic structure of the DPBD molecule by constructing the complex propagates all over the carbon sites and that the distortion of the electronic structure of the complex becomes continuously large as temperature is decreased. This phenomenon is closely related to the thermochromism. The mechanism of the temperature variation of the electronic structure of the complex was attributed to the dynamics of phenyl ring and cyclopentadienyl ring of the complex. Fast rotation of the cyclopentadienyl ring around its fivefold axis with the extremely small activation energy of 28 meV (=2.6 kJ/mol) and 180 degrees flip rotation of the phenyl ring about the C-C bond with the activation energy of 84 meV (=7.7 kJ/mol) were recognized by the measurement of the spin-lattice relaxation rate of proton NMR. Semiempirical ZINDO molecular orbital calculation revealed that the deep color of the complex originates in the HOMO-LUMO and HOMO-LUMO+1 transitions. These molecular orbitals are sensitive to the orientation of the pi-orbital of cyclopentadienyl rings, suggesting that the dynamic perturbation is operative for the transition energies., AMER CHEMICAL SOC
JOURNAL OF PHYSICAL CHEMISTRY B, 1997年01月, ［査読有り］

Syndiospecific polymerization of methyl methacrylate catalyzed by lanthanoid thiolate complexes bearing a hexamethylphosphoric triamide ligand
Y Nakayama; T Shibahara; H Fukumoto; A Nakamura; K Mashima, AMER CHEMICAL SOC
MACROMOLECULES, 1996年11月, ［査読有り］

Synthesis of Arenethiolate Complexes of Divalent and Trivalent Lanthanides from Metallic Lanthanides and Diaryl Disulfides: Crystal Structures of [{Yb(hmpa)3}2(-SPh)3][SPh] and Ln(SPh)3(hmpa)3 (Ln = Sm, Yb; hmpa = Hexamethylphosphoric Triamide)
Mashima, K; Nakayama, Y; Shibahara, T; Fukumoto, H; Nakamura, A, A convenient and one-pot synthetic method of lanthamide thiolate was developed. An excess of metallic samarium, europium, and ytterbium directly reacted with diaryl disulfides in THF to give selectively Ln(II) thiolate complexes, [Ln(SAr)(mu-SAr)(thf)(3))(]2) (1, Ln = Sm; 2, Ln = Eu; Ar = 2,4,6-triisopropylphenyl), Yb(SAr)(2)(py)(4) (3, py = pyridine), and [{Ln(hmpa)(3)}(2)(mu-SPh)(3)][SPh] (6, Ln = Sm; 7, Ln = Eu; 8, Ln = Yb; hmpa = hexamethylphosphoric triamide). Reaction of metallic lanthanides with 3 equiv of disulfides afforded Ln(III) thiolate complexes, Ln(SAr)(3)(py)(n)(thf)(3-n) (9a, Ln = Sm, n = 3; 9b, Ln = Sm, n = 2; 10, Ln = Yb, n = 3) and Ln(SPh)3(hmpa)3 (11, Ln = Sm; 12, Ln = Eu; 13, Ln = Yb). Thus, Ln(II) and Ln(III) thiolate complexes were prepared from the same source by controlling the stoichiometry of the reactants. X-ray analysis of 8 revealed that 8 has the first ionic structure composed of triply bridged dinuclear cation and benezenethiolate anion [8, orthorhombic, space group P2(1)2(1)2(1) with a = 21.057(9), b = 25.963(7), c = 16.442(8) Angstrom, V = 8988(5) Angstrom(3), Z = 4, R = 0.040, R(w) = 0.039 for 5848 reflections with I > 3 sigma(I) and 865 parameters]. The monomeric structures of 11 and 13 were revealed by X-ray crystallographic studied [11, triclinic, space group P (1) over bar with a = 14.719(3), b = 17.989(2), c = 11.344(2) Angstrom, alpha = 97.91(1), beta = 110.30(2), gamma = 78.40(1)degrees, V = 2751.9(9) Angstrom(3), Z = 2, R = 0.045, R(w) = 0.041 for 7111 reflections with I > 3 sigma(I) and 536 parameters; 13, triclinic, space group P (1) over bar with a = 14.565(2), b = 17.961(2), c = 11.302(1) Angstrom, alpha = 97.72(1), beta = 110.49(1), gamma = 78.37(1)degrees, V = 2706.0(7) Angstrom(3), Z = 2, R = 0.031, R(w) = 0.035 for 9837 reflections with I > 3 sigma(I) and 536 parameters]. A comparison with the reported mononuclear and dinuclear lanthamide thiolate complexes has been made to indicate that the Ln-S bonds weakened by the coordination of HMA to lanthanide metals have ionic character., AMER CHEMICAL SOC
Inorg. Chem., 1996年01月, ［査読有り］

Formation of lanthanoid(II) and lanthanoid(III) thiolate complexes derived from metals and organic disulfides: crystal structures of [{Ln(SAr)(m-SAr)(thf)3}2] (Ln=Sm, Eu), [Sm(SAr)3(py)2(thf)] and [Yb(SAr)3(py)3] (Ar=2,4,6-triisopropylphenyl; py=pyridine)
Mashima; K.; Nakayama; Y.; Fukumoto; H.; Kanehisa; N.; Kai; Y.; Nakamura; A., Reaction of metallic samarium, europium and ytterbium with bis(2,4,6-triisopropylphenyl) disulfide gave selectively Ln(II) thiolate complexes, [{Ln(SAr)(mu-SAr)(thf)(3))(2)] Ln = Sm 1; Ln = Eu 2 and [Yb(SAr)(2)(py)(4)] 3, as well as Ln(III) thiolate complexes, [Ln(SAr)(3)(py)(n)(thf)(3-n)]:Ln = Sm, n = 3 4a; Ln = Sm, n = 2 4b; Ln = Yb, n =35, (Ar = 2,4,6-trisopropylphenyl) depending on the stoichiometry of the lanthanoid and the disulfide; the molecular structu res of 1, 2, 4b and 5 were determined by X-ray crystallography., ROYAL SOC CHEMISTRY
J. Chem. Soc., Chem Commun., 1994年, ［査読有り］

Metal Complexes of pi-Conjugated Polymers
Takakazu Yamamoto; Hiroki Fukumoto; Take-aki Koizumi
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS, 2009年03月, ［査読有り］

Combinatorial physical vapor deposition of pi-conjugated organic thin film libraries
H Fukumoto; Y Muramatsu; T Yamamoto; J Yamaguchi; K Itaka; H Koinuma
MACROMOLECULAR RAPID COMMUNICATIONS, 2004年01月, ［査読有り］

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Yamamoto; T.; Fukumoto; H., 分担執筆
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芳香族π共役高分子の光・電子機能、次世代高分子設計　　　　　　　　　　　　　　　
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2017年, 基礎有機化学会

2012年, フッ素化学会

2000年, 錯体化学会

1999年, 高分子学会

1994年, 日本化学会

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