研究者詳細 - 岡本　秀毅

論文 - 岡本　秀毅

分割表示 105 件中 41 - 60 件目／全件表示 >>

Fabrication of flexible high-performance organic field-effect transistors using phenacene molecules and their application toward flexible CMOS inverters 査読国際共著国際誌

Emanuela Pompei, Claudio Turchetti, Shino Hamao, Akari Miura, Hidenori Goto, Hideki Okamoto, Akihiko Fujiwara, Ritsuko Eguchi, Yoshihiro Kubozono

Journal of Materials Chemistry C 7 ( 20 ) 6022 - 6033 2019年

Photophysical features of naphthols having esters, formyl and acetyl groups and the difluoroboronated complex in solution and the solid state 査読国際誌

Minoru Yamaji, Hideki Okamoto

Journal of Photochemistry and Photobiology A: Chemistry 360 204 - 209 2018年6月

Synthesis of isomeric coumarin-fluorene hybrids by photocyclization and the photophysical features 査読国際誌

Minoru Yamaji, Hideki Okamoto, Kenta Goto, Shin-ichiro Kato, Fumito Tani, Yosuke Nakamura

Tetrahedron Letters 59 ( 13 ) 1216 - 1219 2018年3月

Excited-state intramolecular proton transfer (ESIPT) fluorescence from 3-amidophthalimides displaying RGBY emission in the solid state 査読

Hideki Okamoto, Kazumasa Itani, Minoru Yamaji, Hiroyuki Konishi, Hiromi Ota

Tetrahedron Letters 59 ( 4 ) 388 - 391 2018年1月

Fluorescence behaviour of 2-, 3- and 4-amino-1,8-naphthalimides: effects of the substitution positions of the amino functionality on the photophysical properties 査読国際誌

Lei Wang, Mayu Fujii, Minoru Yamaji, Hideki Okamoto

Photochemical & Photobiological Sciences 17 ( 10 ) 1319 - 1328 2018年

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Springer Science and Business Media LLC

<p>2-Amino-1,8-naphthalimide showed blue fluorescence independent of the microenvironment of the solvents whereas the corresponding 3- and 4-amino derivatives displayed marked positive solvatofluorochromism.</p>

DOI： 10.1039/c8pp00302e

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Blue Fluorescence from BF2 Complexes of N,O-Benzamide Ligands: Synthesis, Structure, and Photophysical Properties 査読

Minoru Yamaji, Shin-ichiro Kato, Kazuhiro Tomonari, Michitaka Mamiya, Kenta Goto, Hideki Okamoto, Yosuke Nakamura, Fumito Tani

Inorganic Chemistry 56 ( 20 ) 12514 - 12519 2017年10月

Synthesis, structure, and photoreactions of fluorinated 2,11-diaza[32]paracyclophane: Photochemical formation of cage-diene type benzene dimer 査読

Hideki Okamoto, Tetsuya Kozai, Zenji Okabayashi, Teruo Shinmyozu, Hiromi Ota, Kiichi Amimoto, Kyosuke Satake

Journal of Physical Organic Chemistry 30 ( 9 ) e3726 - e3726 2017年9月

Convenient Phenacene Synthesis by Sequentially Performed Wittig Reaction and Mallory Photocyclization Using Continuous-Flow Techniques 査読

Hideki Okamoto, Haruhiko Takahashi, Takamitsu Takane, Yasuhiro Nishiyama, Kiyomi Kakiuchi, Shin Gohda, Minoru Yamaji

SYNTHESIS-STUTTGART 49 ( 13 ) 2949 - 2957 2017年7月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：GEORG THIEME VERLAG KG

Various phenacenes possessing chrysene, picene, and fulminene frameworks were prepared by using a continuous-flow synthetic protocol in which Wittig reaction affording diarylethenes and their Mallory photocyclization producing phenacene skeletons were sequentially performed. The Wittig reaction solution, containing the diarylethene obtained from an arylaldehyde and an arylmethyltriphenylphosphonium salt, was mixed with an iodine solution in the flow system and, subsequently, the solution was subjected to the photoreaction. Desired phenacenes were obtained with high to moderate chemical yield. For the present protocol, isolation of the intermediary diarylethene, which is the key precursor of the phenacene, is unnecessary. The approach provides a convenient method to supply a variety of phenacene samples, which are needed for initial systematic surveys in material science.

DOI： 10.1055/s-0036-1588775

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Adsorption of Phenacenes on a Metallic Substrate: Revisited 査読

Song-Wen Chen, I-Chen Sang, Hideki Okamoto, Germar Hoffmann

The Journal of Physical Chemistry C 121 ( 21 ) 11390 - 11398 2017年6月

Systematic investigations on fused π-system compounds of seven benzene rings prepared by photocyclization of diphenanthrylethenes 査読

Shota Fujino, Minoru Yamaji, Hideki Okamoto, Toshiki Mutai, Isao Yoshikawa, Hirohiko Houjou, Fumito Tani

Photochemical and Photobiological Sciences 16 ( 6 ) 925 - 934 2017年6月

Photochemical synthesis and photophysical properties of coumarins bearing extended polyaromatic rings studied by emission and transient absorption measurements 査読

Minoru Yamaji, Yuma Hakoda, Hideki Okamoto, Fumito Tani

PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES 16 ( 4 ) 555 - 563 2017年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ROYAL SOC CHEMISTRY

We prepared a variety of coumarin derivatives having expanded pi-electron systems along the direction crossing the C-3-C-4 bond of the coumarin skeleton via a photochemical cyclization process and investigated their photophysical features as a function of the number (n) of the added benzene rings based on emission and transient absorption measurements. Upon increasing n, the fluorescence quantum yields of the pi-extended coumarins increased. Expanding the p-electron system on the C-3-C-4 bond of the coumarin skeleton was found to be efficient for increasing the fluorescence ability more than that on the C-7-C-8 bond. Introducing the methoxy group at the 7-position was also efficient for enhancing the fluorescence quantum yield and rate of the expanded coumarins. The non-radiative process from the fluorescence state was not substantially influenced by the expanded pi-electron system. The competitive process with the fluorescence was found to be intersystem crossing to the triplet state based on the observations of the triplet-triplet absorption. The effects of the expanded pi-electron systems on the fluorescence ability were investigated with the aid of TD-DFT calculations.

DOI： 10.1039/c6pp00399k

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Chemical analysis of superconducting phase in K-doped picene 査読

Takashi Kambe, Saki Nishiyama, Huyen L. T. Nguyen, Takahiro Terao, Masanari Izumi, Yusuke Sakai, Lu Zheng, Hidenori Goto, Yugo Itoh, Taiki Onji, Tatsuo C. Kobayashi, Hisako Sugino, Shin Gohda, Hideki Okamoto, Yoshihiro Kubozono

JOURNAL OF PHYSICS-CONDENSED MATTER 28 ( 44 ) 2016年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：IOP PUBLISHING LTD

Potassium-doped picene (K(3.0)picene) with a superconducting transition temperature (TC) as high as 14 K at ambient pressure has been prepared using an annealing technique. The shielding fraction of this sample was 5.4% at 0 GPa. The TC showed a positive pressure-dependence and reached 19 K at 1.13 GPa. The shielding fraction also reached 18.5%. To investigate the chemical composition and the state of the picene skeleton in the superconducting sample, we used energy-dispersive x-ray (EDX) spectroscopy, MALDI-time-of-flight (MALDI-TOF) mass spectroscopy and x-ray diffraction (XRD). Both EDX and MALDI-TOF indicated no contamination with materials other than K-doped picene or K-doped picene fragments, and supported the preservation of the picene skeleton. However, it was also found that a magnetic K-doped picene sample consisted mainly of picene fragments or K-doped picene fragments. Thus, removal of the component contributing the magnetic quality to a superconducting sample should enhance the volume fraction.

DOI： 10.1088/0953-8984/28/44/444001

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Recent progress on carbon-based superconductors 査読

Yoshihiro Kubozono, Ritsuko Eguchi, Hidenori Goto, Shino Hamao, Takashi Kambe, Takahiro Terao, Saki Nishiyama, Lu Zheng, Xiao Miao, Hideki Okamoto

Journal of Physics: Condensed Matter 28 ( 33 ) 334001 - 334001 2016年8月

Synthesis and photophysical properties of difluoroboronated β-diketones with the fluorene moiety that have high fluorescence quantum yields 査読

Yurie Suwa, Minoru Yamaji, Hideki Okamoto

Tetrahedron Letters 57 ( 15 ) 1695 - 1698 2016年4月

Synthesis and transistor application of the extremely extended phenacene molecule, [9] phenacene 査読

Yuma Shimo, Takahiro Mikami, Shino Hamao, Hidenori Goto, Hideki Okamoto, Ritsuko Eguchi, Shin Gohda, Yasuhiko Hayashi, Yoshihiro Kubozono

SCIENTIFIC REPORTS 6 2016年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：NATURE PUBLISHING GROUP

the widespread interest in the chemistry, physics and materials science of such molecules and their potential applications. In particular, extended phenacene molecules, consisting of coplanar fused benzene rings in a repeating W-shaped pattern have attracted much attention because field-effect transistors (FETs) using phenacene molecules show promisingly high performance. Until now, the most extended phenacene molecule available for transistors was [8] phenacene, with eight benzene rings, which showed very high FET performance. Here, we report the synthesis of a more extended phenacene molecule, [9] phenacene, with nine benzene rings. Our synthesis produced enough [9] phenacene to allow the characterization of its crystal and electronic structures, as well as the fabrication of FETs using thin-film and single-crystal [9] phenacene. The latter showed a field-effect mobility as high as 18 cm(2) V-1 s(-1), which is the highest mobility realized so far in organic single-crystal FETs.

DOI： 10.1038/srep21008

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Preparation and photophysical properties of fluorescent difluoroboronated β-diketones having phenanthrene moieties studied by emission and transient absorption measurements 査読

Michitaka Mamiya, Yurie Suwa, Hideki Okamoto, Minoru Yamaji

Photochemical and Photobiological Sciences 15 ( 2 ) 278 - 286 2016年

Photochemically-assisted synthesis and photophysical properties of difluoroboronated β-diketones with fused four-benzene-ring chromophores, chrysene and pyrene 査読

Michitaka Mamiya, Yurie Suwa, Hideki Okamoto, Minoru Yamaji

Photochemical and Photobiological Sciences 15 ( 7 ) 928 - 936 2016年

Photophysical and photochemical processes of excited singlet and triplet [3n]cyclophanes (n = 2–6) studied by emission measurements, steady-state and laser flash photolyses 査読

Minoru Yamaji, Hideki Okamoto, Yuhko Hakoshima, Teruo Shinmyozu

J. Phys. Chem. A 119 ( 10 ) 1867 - 1874 2015年3月

Transistors fabricated using the single crystals of [8]phenacene 査読

Yuma Shimo, Takahiro Mikami, Hiroto T. Murakami, Shino Hamao, Hidenori Goto, Hideki Okamoto, Shin Gohda, Kaori Sato, Antonio Cassinese, Yasuhiko Hayashi, Yoshihiro Kubozono

JOURNAL OF MATERIALS CHEMISTRY C 3 ( 28 ) 7370 - 7378 2015年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ROYAL SOC CHEMISTRY

Field-effect transistors (FETs) with single crystals of a new phenacene-type molecule, [8]phenacene, were fabricated and characterized. This new molecule consists of a phenacene core of eight benzene rings, with an extended p-conjugated system, which was recently synthesized for use in an FET by our group. The FET characteristics of an [8]phenacene single-crystal FET with SiO2 gate dielectrics show typical p-channel properties with an average field-effect mobility, <mu >, as high as 3(2) cm(2) V-1 s(-1) in two-terminal measurement mode, which is a relatively high value for a p-channel single-crystal FET. The hmi was determined to be 6(2) cm(2) V-1 s(-1) in four-terminal measurement mode. Low-voltage operation was achieved with PbZr0.52Ti0.48O3 (PZT) as the gate dielectric, and an electric-double-layer (EDL) capacitor. The <mu > and average values of absolute threshold voltage, <vertical bar V-th vertical bar >, were 1.6(4) cm(2) V-1 s(-1) and 5(1) V, respectively, for PZT, and 4(2) x 10(-1) cm(2) V-1 s(-1) and 2.38(4) V, respectively, for the EDL capacitor; these values were evaluated in two-terminal measurement mode. The inverter circuit was fabricated using [8]phenacene and N, N'-1H, 1H-perfluorobutyldicyanoperylene-carboxydi-imide single-crystal FETs. This is the first logic gate circuit using phenacene molecules. Furthermore, the relationship between mu and the number of benzene rings was clarified based on this study and the previous studies on phenacene single-crystal FETs.

DOI： 10.1039/c5tc00960j

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Photochemical synthesis of diphenylphenanthrenes, and the photophysical properties studied by emission and transient absorption measurements 査読

Minoru Yamaji, Yuuma Hakoda, Ami Horimoto, Hideki Okamoto

Rapid communications in Photoscience 4 73 - 75 2014年

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