研究業績

2024

  1. Unraveling the Activity and Stability of Cationic Tellurium Activators in Ritter-Type Reactions
    Koji Takagi,* Shuhei Hayashi, and Souma Sugie
    Chem. Commun., 2024, 60(82), 11786–11789.
    DOI: 10.1039/D4CC03268C
  2. Controlled Cationic Polymerization with Organotellurium Catalysts utilizing Redox-Mediated Chalcogen Bonding Interaction
    Koji Takagi,* Shuhei Hayashi, and Nao Sakakibara
    Macromolecules, 2024, 57(7), 3358–3367.
    DOI: 10.1021/acs.macromol.4c00325
  3. CO2 gas-triggered wettability control of silylation-modified CNC films by manipulating the surface structure and introducing tertiary amino groups
    Hiroyuki Taniyama and Koji Takagi*
    Polym. J., 2024, 56(6), 609–617.
    DOI: 10.1038/s41428-024-00888-8

2023

  1. Pnictogen bonding-mediated controlled cationic polymerization of styrene derivatives –Catalytic activity investigation using non-ionic and ionic pnictogen compounds–
    Tomoki Hasegawa and Koji Takagi*
    J. Polym. Sci., 2023, 61(21), 2655–2664
    DOI: 10.1002/pol.20230364
  2. Controlling surface structure and functionalization of a cellulose nanocrystal film modified by using glycidyl silane through a coating process
    Hiroyuki Taniyama and Koji Takagi*
    Polym. J., 2023, 55, 675–682
    DOI: 10.1038/s41428-023-00763-y

2022

  1. Synthesis, Physical Properties, and OFET Characteristics of a Propeller-Shaped Molecule with a Dithiarubicene Blade
    Kenji Tsukamoto, Koji Takagi,* Seihou Jinnai, Yutaka Ie, Mitsuo Hara, and Takanori Fukushima
    Mol. Syst. Des. Eng., 2022, 7(12), 1639–1649
    DOI: 10.1039/D2ME00168C
  2. Palladium-Catalyzed Intramolecular Direct Arylation of Aromatic Tertiary Amide Compounds Revisited
    Koji Takagi,* Asuka Maeda, and Ryotaro Tsunekawa
    Results in Chemistry, 2022, 4, 100432 (open access)
    DOI: 10.1016/j.rechem.2022.100432
  3. Oxidative (Co)polymerization of Dithiarubicene Derivatives and Electrochromic Properties of Narrow Bandgap Conjugated Polymers
    Koji Takagi,* Takeru Yamamori, and Kenji Tsukamoto
    Polym. J., 2022, 54(5), 1055–1062
    DOI: 10.1038/s41428-022-00655-7
  4. Application of Thiourea/Halogen Bonding Donor Co-catalysis in Metal-Free Cationic Polymerization of Isobutyl Vinyl Ether and Styrene Derivatives
    Koji Takagi,* Hiroto Murakata, and Tomoki Hasegawa
    Macromolecules, 2022, 55(13), 5756–5765
    DOI: 10.1021/acs.macromol.2c00281
  5. Controlled/Living Cationic Polymerization of p-Methoxystyrene using Tellurium-Based Chalcogen Bonding Catalyst–Discovery of New Water-Tolerant Lewis Acid Catalyst
    Koji Takagi,* Nao Sakakibara, Tomoki Hasegawa, and Shuhei Hayashi
    Macromolecules, 2022, 55(9), 3671–3680
    DOI: 10.1021/acs.macromol.2c00261
  6. Study on controlling the surface structure and properties of cellulose nanocrystal film modified by alkoxysilanes in green solvents
    Hiroyuki Taniyama and Koji Takagi*
    Langmuir, 2022, 38(18), 5550–5556
    DOI: 10.1021/acs.langmuir.2c00122
  7. Toward the synthesis of a belt-shaped cyclic pi-conjugated system comprising para-phenylene framework and amide bridging unit
    Koji Takagi,* Daiki Miyamoto, Hinako Yamaguchi, and Isao Azumaya
    Bull. Chem. Soc. Jpn., 2022, 95(1), 47–51
    DOI: 10.1246/bcsj.20210340
    BCSJ Award Articleに選ばれました
    　　　　
  8. 高周期元素化合物を触媒に用いる高分子合成法の開拓
    ファルマシア（最前線）, (公社)日本薬学会, 2022, 58(10), 938–942.

2021

  1. Dicationic oligotelluroxane or mononuclear telluronium cation? Elucidation of true catalytic species and activation mechanism of benzylic carbon-halogen bond
    Koji Takagi,* Nao Sakakibara, Shoko Kikkawa, and Seiji Tsuzuki
    Chem. Commun., 2021, 57(100), 13736–13739
    DOI: 10.1039/D1CC06311A
  2. End-functionalization of dithiarubicene: Modulation of optoelectronic properties by metal-catalyzed coupling reactions and device application
    Kenji Tsukamoto, Koji Takagi,* Keitaro Yamamoto, Yutaka Ie, and Takanori Fukushima
    J. Mater. Chem. C, 2021, 9(18), 5920–5929
    DOI: 10.1039/D1TC01169C
  3. Stereoselectivity in Dehydrative Cyclic Trimerization of Substituted 4-Alkylaminobenzoic Acids
    Koji Takagi,* Hinako Yamaguchi, Daiki Miyamoto, Yuka Deguchi, Takehiro Hirao, and Takeharu Haino
    New J. Chem., 2021, 45(3), 1187–1193
    DOI: 10.1039/D0NJ05368F

2020

  1. Cationic Polymerization of Vinyl Monomers using Halogen Bonding Organocatalysts with Varied Activity
    Koji Takagi,* Hiroto Murakata, Koji Yamauchi, and Kohei Hashimoto
    Polym. Chem. 2020, 11(42), 6739–6744
    DOI: 10.1039/D0PY01207F
    EurekAlertに掲載

2019

  1. pi-Extension of Electron-Accepting Dithiarubicene with a Cyano-Substituted Electron-Withdrawing Group and Application in Air-Stable n-Channel Organic Field Effect Transistors
    Kenji Tsukamoto, Koji Takagi,* Shusaku Nagano, Mitsuo Hara, Yutaka Ie, Kohtaro Osakada, and Daisuke Takeuchi
    J. Mater. Chem. C 2019, 7(40), 12610–12618
    DOI: 10.1039/C9TC04325J
  2. Charge-Neutral and Self-Doped Cyclopentadithiophene-Based Conjugated Polymers: Influence of Side Chain on Optical, Electrical, and Thermoelectric Properties
    Koji Takagi,* Hiroki Yano, Hiroki Ito, and Naoki Kishi
    Polymer 2019, 181, 121787
    DOI: 10.1016/j.polymer.2019.121787
  3. Cationic Polymerization of n-Hexyloxyallene by using Halogen Bonding Organocatalysts
    Koji Takagi* and Kanami Okamura
    J. Polym. Sci, Part A: Polym. Chem. 2019, 57(24), 2436–2441.
    DOI: 10.1002/pola.29489
  4. Ladderization of Poly(p-phenylenevinylene) Derivative: Synthesis of Polycyclic Aromatic Hydrocarbon Polymer by Intramolecular Oxidative Cyclization
    Koji Takagi* and Yoshihiro Yamada
    Polymer 2019, 179, 121607.
    DOI: 10.1016/j.polymer.2019.121607
  5. Ladderization of Polystyrene Derivatives by Palladium-Catalyzed Polymer Direct Arylation
    Koji Takagi,* Hidetoshi Tanaka, and Koichiro Mikami*
    Polym. Chem. 2019, 10(21), 2647–2652.
    DOI: 10.1039/C9PY00359B
  6. Potentially Helical Imidazole-Containing Conjugated Oligomer: Synthesis, Optical Properties, and Conformation
    Koji Takagi,* Jun-ya Ohta, Kenta Sugihara, Kanami Okamura, and Yoshihiro Yamada
    Polym. J. 2019, 51(4), 389–395.
    DOI: 10.1038/s41428-018-0146-3
  7. Chiral Non-Planar Oligophenylenes bridged by Urea Linkage: Synthesis through Intramolecular Direct Arylation, Chiroptical Behavior, and Theoretical Investigation
    Koji Takagi,* Yuto Hirano, Koichiro Mikami,* Shoko Kikkawa, and Isao Azumaya
    Eur. J. Org. Chem. 2019, 2019(10), 2071–2080.
    DOI: 10.1002/ejoc.201900191
  8. ハロゲン結合性有機分子触媒によるメタルフリーカチオン重合
    高木幸治, 山内光司, 橋本康平, 岡村花奈美
    触媒（特集号）精密高分子合成に関する最近の研究動向, 触媒学会, 2019, 61(3), 157–162.

2018

  1. Creating Elastic Organic Crystals of π-Conjugated Molecules with Bending Mechanofluorochromism and Flexible Optical Waveguide
    Shotaro Hayashi,* Shun-ya Yamamoto, Daisuke Takeuchi, Yutaka Ie, and Koji Takagi*
    Angew. Chem. Int. Ed. 2018, 57(52), 17002-17008
    DOI: 10.1002/anie.201810422
    Highlighted in the inside cover
    DOI: 10.1002/anie.201813330
  2. Synthesis and Structure of Optically-Active Oligo(N-substituted-m-benzamide)s bearing Bithiophene Chromophore on the Benzene Ring
    Koji Takagi,* Yuma Nishikawa, Kana Shimizu, Katsuya Nobuke, Ryohei Yamakado, Shinri Sugimoto, and Yoshihito Inai*
    Macromol. Chem. Phys. 2018, 1800298.
    DOI: 10.1002/macp.201800298
  3. Synthesis and Field-Effect Transistor Application of π-Extended Lactam-Fused Conjugated Oligomers obtained by the Tandem Direct Arylation
    Koji Takagi,* Shun-ya Yamamoto, Kenji Tsukamoto, Yuto Hirano, Mitsuo Hara, Shusaku Nagano, Yutaka Ie, and Daisuke Takeuchi
    Chem. Eur. J. 2018, 24(53), 14137–14145.
    DOI: 10.1002/chem.201801399
  4. Solid-State Esterification via Ionic-to-Covalent Bond Transformation in Ionic Molecular Crystals Consisting of Disubstituted Anthracene Anion-Cation Combinations
    Masato Suzuki,* Takahiro Fujii, Yoko Naito, Kazuhisa Yamoto, Shin-ichi Matsuoka, Koji Takagi, Haruki Sugiyama, and Hidehiro Uekusa
    Bull. Chem. Soc. Jpn. 2018, 91(3), 343–348.
    DOI: 10.1246/bcsj.20170349
    BCSJ Award Articleに選ばれました
  5. ESIPT Emission Behavior of Methoxy-Substituted 2-Hydroxyphenylbenzimidazole Isomers
    Koji Takagi,* Yoshihiro Yamada, Ryoichi Fukuda,* Masahiro Ehara, and Daisuke Takeuchi
    New J. Chem. 2018, 42(8), 5923–5928.
    DOI: 10.1039/C8NJ00455B
  6. 元素の能力を利用する金属を用いない重合
    ペトロテック, (公社)石油学会, 2018, 41(5), 395–399.

2017

  1. Synthesis and Optical Properties of ESIPT-Active π-Conjugated Benzimidazole Compounds: Influence of Structure Rigidification by Ring Fusion
    Koji Takagi,* Kaede Ito, Yoshihiro Yamada, Takuya Nakashima, Ryoichi Fukuda, Masahiro Ehara, and Hyuma Masu
    J. Org. Chem., 2017, 82(23), 12173–12180.
    DOI: 10.1021/acs.joc.7b01967
  2. Synthesis and Optical Properties of Fused pi-Conjugated Imidazole Compounds
    Koji Takagi,* Kaede Ito, Yoshihiro Yamada, Takuya Nakashima, Ryoichi Fukuda, Masahiro Ehara, and Daisuke Takeuchi
    Chem. Lett., 2017, 46(9), 1372–1375.
    DOI: 10.1246/cl.170569
  3. Regioselective Halogen-Magnesium Exchange Reaction of Bithiophene Derivative bearing Methoxy and Pyridine Groups at the beta-Position and Kumada Coupling Polymerization
    Koji Takagi,* Ryo Kouchi, and Junpei Kawai
    Polym. J., 2017, 49(9), 649–654.
    DOI: 10.1038/pj.2017.37
  4. Halogen Bonding-Mediated Controlled Cationic Polymerization of Isobutyl Vinyl Ether: Expanding the Catalytic Scope of 2-Iodoimidazolium Salts
    Koji Takagi,* Koji Yamauchi, and Hiroto Murakata
    Chem. Eur. J., 2017, 23, 9495–9500. Highlighted as a Hot Paper
    DOI: 10.1002/chem.201702455

    Press Release
    EurekAlertに掲載
    Chemical Processingに掲載
    接着剤新聞 2017年8月1日(火曜日) 12面掲載
    日経産業新聞 2017年8月22日(火曜日) 8面掲載
    日刊工業新聞 2017年9月8日(木曜日) 21面掲載

  5. Termination Reaction of Living Poly(3-hexylthiophene) using Thiophene Grignard Reagents: Substituent Effect on the Functionalization
    Koji Takagi,* Junpei Kawai, and Ryo Kouchi
    Polymer, 2017, 117, 354–363.
    DOI:10.1016/j.polymer.2017.04.041
  6. Synthesis of Polythiophene Derivative bearing Methoxy and Pyridine Groups at the ß-Position and Formation of an Intramolecular Hydrogen Bonding through the Polymer Reaction
    Koji Takagi,* Ryo Kouchi, and Junpei Kawai
    Polymer, 2017, 114, 221–230.
    DOI: 10.1016/j.polymer.2016.11.013
  7. Precision Spatial Arrangement of Chromophores using Cyclic Aromatic Triamide Scaffold (Chapter 12)
    Koji Takagi and Ryohei Yamakado
    Conjugated Objects: Development, Synthesis, and Application (Book, Pan Stanford Publishing)
    Atsushi Nagai and Koji Takagi Eds.
    https://www.crcpress.com/Conjugated-Objects-Developments-Synthesis-and-Applications/Nagai-Takagi/p/book/9789814774031

2016

  1. Synthesis and Optical Properties of pi-Conjugated Polymers containing Fused Imidazole Skeleton
    Koji Takagi,* Takuya Miwa, and Hyuma Masu
    Macromolecules, 2016, 49(23), 8879–8887.
    DOI: 10.1021/acs.macromol.6b01768
  2. Molecular Design for Tuning Electronic Structure of pi-Conjugated Polymers Containing Fused Dithienobenzimidazole Units
    Koji Takagi,* Tomoharu Kuroda, Masanori Sakaida, and Hyuma Masu
    Polymer, 2016, 107, 191–199.
    DOI: 10.1016/j.polymer.2016.11.013
  3. Synthesis and Optical Properties of Poly(N-octyl-m-benzamide)s bearing an Oligothiophene Chromophore on the Benzene Ring
    Koji Takagi,* Yuma Nishikawa, Kana Shimizu, Ryohei Yamakado, Shinri Sugimoto, and Masaharu Kondo
    Polym. J., 2016, 48(5), 605–610.
    DOI: 10.1038/pj.2015.130
  4. Fused π-Conjugated Imidazolium Liquid Crystals: Synthesis, Self- Organization, and Fluorescent Properties
    Koji Takagi,* Koji Yamauchi, Seiko Kubota, Shusaku Nagano, Mitsuo Hara, Takahiro Seki, Kazuya Murakami, Yousuke Ooyama, Joji Ohshita, Masaharu Kondo, and Hyuma Masu
    RSC Advances, 2016, 6(11), 9152–9159.
    DOI: 10.1039/C5RA25496E

2015

  1. Amide-bridged ladder poly(p-phenylene): synthesis by direct arylation and p-stacked assembly
    Koji Takagi,* Ryota Kato, Shun-ya Yamamoto, and Hyuma Masu
    Polym. Chem., 2015, 6(38), 6792–6795
    DOI: 10.1039.C5PY01154J
  2. Synthesis and optical properties of imidazole and benzimidazole-based fused pi-conjugated compounds: Influence of substituent, counter anion, and pi-conjugated system
    Koji Takagi,* Kazuma Kusafuka, Yohei Ito, Koji Yamauchi, Kaede Ito, Ryoichi Fukuda, and Masahiro Ehara
    J. Org. Chem. 2015, 80(14), 7172–7183
    DOI: 10.1021/acs.joc.5b01028
  3. Diastereoselective Cyclization of Aminobenzoic Acid Derivative and Chiroptical Properties of Triple-Stranded Helical Bis(phenylethynyl)benzene
    Ryohei Yamakado, Shin-ichi Matsuoka, Masato Suzuki, Daisuke Takeuchi, Hyuma Masu, Isao Azumaya, and Koji Takagi*
    Chem. Commun. 2015, 51(26), 5710–5713
    DOI: 10.1039/C5CC00945F
  4. Solid-State Polycondensation via Ionic-to-Covalent Bond Transformation to Control Polymer Structure: Preparation of Porphyrin-Based Ladder Polyme
    Masato Suzuki,* Kohei Yokota, Hiroe Tsuchida, Kazuhisa Yamoto, Masayuki Nagata, Shin-ichi Matsuoka, Koji Takagi, Kohei Johmoto, and Hidehiro Uekusa
    ACS Macro Lett. 2015, 4(2), 247–250
    DOI: 10.1021/acsmacrolett.5b00013

2014

  1. Aggregation of Polythiophene Homopolymer and Block Copolymer in Solution Utilizing the Characteristics of Pyridine at the Side Chain
    Koji Takagi,* Eiki Kawagita, Ryo Kouchi, and Junpei Kawai
    J. Polym. Sci. Part A: Polym. Chem. 2014, 52(23), 3383–3389
    DOI: 10.1002/pola.27403
  2. Synthesis and Characterization of Polythiophene Derivatives with Nitrogen Heterocycles at the Side Chain
    Koji Takagi,* Eiki Kawagita, and Ryo Kouchi
    J. Polym. Sci. Part A: Polym. Chem. 2014, 52(15), 2166–2174
    DOI: 10.1002/pola.27228
  3. Synthesis, Reaction, and Optical Properties of Cyclic Trimer bearing 9,10-Diphenylanthracene Based on an Aromatic Tertiary Amide Skeleton
    Ryohei Yamakado, Shin-ichi Matsuoka, Masato Suzuki, Daisuke Takeuchi, Hyuma Masu, Isao Azumaya, and Koji Takagi*
    RSC Adv. 2014, 4(13), 6752–6760
    DOI: 10.1039/C3RA46652C
  4. Synthesis and Optoelectronic Properties of Conjugated Polymers Based on a Dithienobenzimidazole Unit in the Main Chain
    Koji Takagi,* Masanori Sakaida, Kazuma Kusafuka, and Takuya Miwa
    J. Polym. Sci. Part A: Polym. Chem. 2014, 52(3), 401–409
    DOI: 10.1002/pola.27013

2013

  1. Synthesis and Optical Properties of Poly(p-benzamide)s bearing Oligothiophene on Amide Nitrogen Atom through Alkylene Spacer
    Koji Takagi,* Katsuya Nobuke, Yuma Nishikawa, and Ryohei Yamakado
    Polym. J. 2013, 45(12), 1171–1176
    DOI: 10.1038/pj.2013.52
  2. N-Heterocyclic Carbene-Catalyzed Cyclotetramerization of Acrylates
    Shin-ichi Matsuoka,* Shoko Namera, Atsushi Washio, Koji Takagi, and Masato Suzuki
    Org. Lett. 2013, 15(23), 5916–5919
    DOI: 10.1021/ol4021942
  3. Experimental Mechanistic Studies of the Tail-to-Tail Dimerization of Methyl Methacrylate Catalyzed by N-Heterocyclic Carbene
    Terumasa Kato, Yoshiya Ota, Shin-ichi Matsuoka,* Koji Takagi, Masato Suzuki
    J. Org. Chem. 2013, 78(17), 8739–8747
    DOI: 10.1021/jo401477b
  4. Helicity Induction in Three p-Conjugated Chromophores by Planar Chirality of Calixamide
    Ryohei Yamakado, Koichiro Mikami,* Koji Takagi,* Isao Azumaya,* Shinri Sugimoto, Shin-ichi Matsuoka, Masato Suzuki, Kosuke Katagiri, Masanobu Uchiyama, and Atsuya Muranaka
    Chem. Eur. J. 2013, 19(36), 11853–11857
    DOI: 10.1002/chem.201301198
  5. Synthesis and Optical Properties of Conjugated Polymers bearing 1,8-Difunctionalized Carbazole Unit
    Koji Takagi,* Hidenobu Takao, and Tsuyoshi Nakagawa
    Polym. J. 2013, 45(4), 396–400
    DOI: 10.1038/pj.2012.153
  6. Synthesis of Green and Blue Fluorescent Ladder-Type Conjugated Imidazolium Compounds
    Koji Takagi,* Yohei Ito, Kazuma Kusafuka, and Masanori Sakaida
    Org. Biomol. Chem. 2013, 11(14), 2245–2248
    DOI: 10.1039/C3OB40164B
  7. A Screw-Shaped Alignment of Pyrene using m-Calix[3]amide
    Ryohei Yamakado, Shin-ichi Matsuoka, Masato Suzuki, Koji Takagi,* Kosuke Katagiri, and Isao Azumaya
    Tetrahedron 2013, 69(5), 1516–1520
    DOI: 10.1016/j.tet.2012.12.015

2012

  1. Sequential One-Pot and Three-Component Reactions of An N-Heterocyclic Carbene to form 4-(1,2,4-Triazol-5-ylidene)pyrrolidine-2,5-diones: A Tandem Umpolung/Annulation Sequence via Deoxy-Breslow Intermediates
    Shin-ichi Matsuoka,* Yusuke Tochigi, Koji Takagi, and Masato Suzuki
    Tetrahedron 2012, 68(47), 9836–9841
    DOI: 10.1016/j.tet.2012.08.076
  2. Preparation of Molecular Cage by Coordination of m-Calix[3]amide bearing Pyridine with Palladium Complex
    Ryohei Yamakado, Shinri Sugimoto, Shin-ichi Matsuoka, Masato Suzuki, Yasuhiro Funahashi, and Koji Takagi*
    Chem. Lett. 2012, 41(3), 249–251
    DOI: 10.1246/cl.2012.249

2011

  1. Organocatalytic Head-to-Tail Dimerization of Methacrolein via Conjugate Addition of Methanol: An Alcohol Activation Mechanism proved by Electrospray Ionization Mass Spectrometry
    Shin-ichi Matsuoka,* Shintaro Shimakawa, Koji Takagi, and Masato Suzuki
    Tetrahedron Lett. 2011, 52, 6835–6838
    DOI: 10.1016/j.tetlet.2011.10.070
  2. Synthesis and Isomerization of Conjugated Oligomers Containing Azoimidazole Unit
    Koji Takagi,* Takato Isomura, Yohei Ito, Masanori Sakaida, Shusaku Nagano, and Takahiro Seki
    J. Polym. Sci. Part A: Polym. Chem. 2011, 49(23), 4993–5000
    DOI: 10.1002/pola.24958
  3. Organocatalytic Tail-to-Tail Dimerization of Olefin: Umpolung of Methyl Methacrylate Mediated by N-Heterocyclic Carbene
    Shin-ichi Matsuoka,* Yoshiya Ota, Atsushi Washio, Akiho Katada, Kenji Ichioka, Koji Takagi, and Masato Suzuki
    Org. Lett. 2011, 13(14), 3722–3725
    DOI: 10.1021/ol201380m
  4. Regioselective Grignard Metathesis Reaction of 2,5-Dibromo-3-(6’-hexylpyridine-2’-yl)thiophene and Kumada Coupling Polymerization
    Koji Takagi,* Hyunho Joo, Yusuke Yamashita, Eiki Kawagita, and Chikako Torii
    J. Polym. Sci. Part A: Polym. Chem. 2011, 49(18), 4013–4020
    DOI: 10.1002/pola.24843
  5. Syntheses of Aliphatic Polycarbonates from 2’- Deoxyribonucleosides
    Masato Suzuki,* Toyokazu Sekido, Shin-ichi Matsuoka, and Koji Takagi
    Biomacromolecules 2011, 12(5), 1449–1459
    DOI: 10.1021/bm101328j
  6. Self-Assembly of Oligothiophene Chromophores by m-Calix[3]amide Scaffold
    Koji Takagi,* Shinri Sugimoto, Ryohei Yamakado, and Katsuya Nobuke
    J. Org. Chem. 2011, 76(8), 2471–2478
    DOI: 10.1021/jo102160x
  7. Polycondensation of 4-Octylaminobenzoic Acid Esters Having Bithiophene at 3-Position and Optical Properties of Polymer
    Katsuya Nobuke, Ryohei Yamakado, and Koji Takagi*
    Kobunshi Ronbunshu 2011, 68(1), 33–38

2010

  1. Poly(3-hexylthiophene)-block-poly(3-semifluoroalkylthiophene) for Polymer Solar Cells
    Ichiko Yamada, Takeshi Toru, Koji Takagi, Yasuhiko Hayashi,* Tetsuo Soga, and Norio Shibata
    Int. J. Mol. Sci. 2010, 11(12), 5027–5039
    DOI: 10.3390/ijms11125027
  2. Synthesis and Characterization of Nitrogen-Linked Carbazole-Containing Fluorescent Polymers
    Koji Takagi,* Hidenobu Takao, and Tsuyoshi Nakagawa
    J. Polym. Sci. Part A: Polym. Chem. 2010, 48(17), 3729–3735
    DOI: 10.1002/pola.24155
  3. Poly(ethylene glycol)-Induced Acceleration of Free Radical Polymerization of Methyl Methacrylate: Effects of Highly Viscous Solvent and Kinetic Study
    Shin-ichi Matsuoka,* Takashi Kikuno, Koji Takagi, and Masato Suzuki
    Polym. J. 2010, 42(5), 368–374
    DOI: 10.1038/pj.2010.17
  4. Synthesis and Light-Emitting Properties of Carbazole-Based Copolymers Bearing Cyano-Substituted Arylenevinylene Chromophore
    Koji Takagi,* Tsuyoshi Nakagawa, and Hidenobu Takao
    J. Polym. Sci. Part A: Polym. Chem. 2010, 48(1), 91–98
    DOI: 10.1002/pola.23764

2009

  1. Polymerization of Fluorene-Based Monomers Modified with Thiavinylidene Structure at 9-Position and Their Optical Properties
    Koji Takagi,* Shinri Sugimoto, Manabu Mitamura, Shin-ichi Matsuoka, and Masato Suzuki
    Synth. Met. 2009, 159(3-4), 228–233.
    DOI: 10.1016/j.synthmet.2008.09.009
  2. Tropolone-Terminated Oligomeric Fluorophores Having Responsive Properties to External Environment
    Koji Takagi,* Kazuhiro Saiki, Hirokazu Hayashi, Hiroyasu Ohsawa, Shin-ichi Matsuoka, and Masato Suzuki
    Bull. Chem. Soc. Jpn. 2009, 82(2), 236–241.
    DOI: 10.1246/bcsj.82.236
  3. Polymerization of Branched Thiophene Monomers and Optoelectronic Properties of Materials
    Koji Takagi,* Chikako Torii, and Yusuke Yamashita
    J .Polym. Sci., Part A: Polym. Chem. 2009, 47(12), 3034–3044.
    DOI: 10.1002/pola.23399
  4. Synthesis of Imidazole-Containing Conjugated Polymers Bearing Phenol Unit as Side Group and Excited State Intramolecular Proton Transfer-Mediated Fluorescence
    Koji Takagi,* Kenta Sugihara, and Takato Isomura
    J .Polym. Sci., Part A: Polym. Chem. 2009, 47(18), 4822–4829.
    DOI: 10.1002/pola.23539
  5. Synthesis and Light-Emitting Behavior of Silicon-Bridged Fluorene Copolymers Bearing Oligoarylenevinylene Chromophore
    Koji Takagi,* Ai Tahara, and Hiroki Kakiuchi
    Polym. J. 2009, 41(9), 733–738.
    DOI: 10.1295/polymj.PJ2009088

2008

  1. Conjugated Oligomers Containing Imidazole in Main Chain with Intramolecular Hydrogen Bonding
    Koji Takagi,* Kenta Sugihara, Junya Ohta, Yasuo Yuki, Shin-ichi Matsuoka, and Masato Suzuki
    Polym. J. 2008, 40(7), 614–621.
    DOI: 10.1295/polymj.PJ2008045
  2. Synthesis and Property of Conjugated Polymers Bearing Non-Benzenoid Aromatic Unit
    Koji Takagi
    THE CHEMICAL TIMES 2008(4), 2–8.
  3. Synthesis of Carbazole-Based Light Emitting Polymers Incorporating Oligo(phenylenevinylene) Fluorophores
    Koji Takagi,* Tsuyoshi Nakagawa, and Hidenobu Takao
    J. Polym. Sci., Part A: Polym. Chem. 2008, 46(24), 8141–8148.
    DOI: 10.1002/pola.23111

2007

  1. Synthesis and Optical Properties of Fluorene-Based Polymers Incorporating Organosilicon Unit
    Koji Takagi,* Hiroki Kakiuchi, Yasuo Yuki, and Masato Suzuki
    J. Polym. Sci., Part A: Polym. Chem. 2007, 45 (21), 4786–4794.
    DOI: 10.1002/pola.22210
  2. Synthesis of Tropolone-Containing Conjugated Polymers and Their Optical Properties
    Koji Takagi,* Kazuhiro Saiki, Kousuke Mori, Yasuo Yuki, Shin-ichi Matsuoka, and Masato Suzuki
    Polym. J. 2007, 39 (8), 813–821.
    DOI: 10.1295/polymj.PJ2007003
  3. Polymeric Oligothiophene Fluorophores Spatially Isolated by Spirobifluorene and Their Emission Properties
    Koji Takagi,* Masaki Momiyama, Junya Ohta, Yasuo Yuki, Shin-ichi Matsuoka, and Masato Suzuki
    Macromolecules 2007, 40(24), 8807–8811.
    DOI: 10.1021/ma071410b

2006

  1. Synthesis of Poly(triazinylstyrene) Containing Nitrogen-Based Ligand and Function as Metal Ion Adsorbent and Oxidation Catalyst
    Koji Takagi,* Satoshi Miwa, and Yasuo Yuki
    React. Funct. Polym. 2006, 66 (12), 1718–1724.
    DOI: 10.1016/j.reactfunctpolym.2006.07.005
  2. Synthesis of Fluorene-Based Light-Emitting Polymers Bearing Silane Unit and Their Optoelectronic Properties
    Koji Takagi,* Hiroki Kakiuchi, and Masato Suzuki
    Kobunshi Ronbunshu 2006, 63 (10), 663–669.

2005

  1. Synthesis of Triazine-Based Solid Polymer Electrolyte Bearing Oligo(ethylene oxide) Chain
    Koji Takagi,* Masaki Muramatsu, Hideo Kunisada, and Yasuo Yuki
    Kobunshi Ronbunshu 2005, 62(5), 208–213.
  2. Synthesis and Photophysical Properties of Polyfluorenes Bearing Silicon-Based Functional Groups
    Koji Takagi*, Satoshi Kunii, and Yasuo Yuki
    J .Polym. Sci. Part A: Polym. Chem. 2005, 43(10), 2119–2117.
    DOI: 10.1002/pola.20689
  3. Ligand Design for Conjugated Polymer-Metal Complex
    Koji Takagi
    Annual Review of Research Group on Macromolecular Complex, 2005, 4.
  4. Functionalization of Propagating End in Radical Polymerization Mediated by Organoselenium Compounds
    Koji Takagi* and Yasuo Yuki
    Kobunshi Kako 2005, 54(6), 39–43.

2004

  1. Tropone-Containing p-Conjugated Polymers: Annulation of Tropone onto Benzene Ring in the Conjugated Polymer
    Naomi Nishioka, Koji Takagi,* Takatoshi Kinoshita, Hideo Kunisada, and Yasuo Yuki
    J. Polym. Sci. Part A: Polym. Chem. 2004, 42(5), 1208–1215.
    DOI: 10.1002/pola.11080
  2. Coordination of Transition Metal Dithiolate Complex to 2,2’-Bipyridine-Based p-Conjugated Polymer
    Shin-ichiro Kato, Koji Takagi*, Kirito Suzuki, Takatoshi Kinoshita, and Yasuo Yuki
    J. Polym. Sci. Part A: Polym. Chem. 2004, 42(11), 2631–2639.
    DOI: 10.1002/pola.20139
  3. Tropone-Containing Conjugated Polymer, Part V Influence of Fused Benzene Ring upon Photophysical Properties
    Koji Takagi*, Kousuke Mori, Hideo Kunisada, and Yasuo Yuki
    Polym. Bull. 2004, 52, 125–132.
    DOI: 10.1007/s00289-004-0270-4

2003

  1. Acid-Doping to Tropone-Containing Conjugated Polymer
    Koji Takagi,* Kousuke Mori, Takatoshi Kinoshita, Hideo Kunisada, and Yasuo Yuki
    Chem. Lett. 2003, 32(6), 552–553.
    DOI: 10.1246/CL.2003.552
  2. Synthesis of Star Polystyrene by Radical Polymerization with 1,2,4,5-Tetrakis(p-tert- butylphenylselenomethyl)benzene as a Novel Photoiniferter
    Tae Seok Kwon,* Koji Takagi, Hideo Kunisada, and Yasuo Yuki
    Eur. Polym. J. 2003, 39 (7), 1437–1441.
    DOI: 10.1016/S0014-3057(03)00016-8
  3. Allylnickel-Catalyzed Living Coordination Polymerization of Allenes with Ester Functionality
    Koji Takagi, Ikuyoshi Tomita,* and Takeshi Endo
    Polym. Bull. 2003, 50(5-6), 335–342.
    DOI: 10.1007/s00289-003-0182-8

2002

  1. π-Conjugated Oligomers Containing Tropone in the Main Chain: Synthesis, Characterization, and Optical Properties
    Koji Takagi,* Yukimi Nishikawa, Naomi Nishioka, Hideo Kunisada, and Yasuo Yuki
    J. Polym. Sci. Part A: Polym. Chem. 2002, 40(22), 3927–3937.
    DOI: 10.1002/pola.10487
  2. Synthesis of Diblock Copolymers by End Functional Polystyrene Containing Phenylseleno Groups as Polymeric Photoiniferter
    Tae Seok Kwon,* Koji Takagi, Hideo Kunisada, and Yasuo Yuki
    J. Macromol. Sci., Pure and Appl. Chem. 2002, A39(9), 991–1006.
    DOI: 10.1081/MA-120013575
  3. The Adsorption of Guest Molecule onto Self-Assembled Monolayer of alpha-Helical Polypeptide
    Issei Aoki, Naomi Nishioka, Koji Takagi, Yasuo Yuki, and Takatoshi Kinoshita*
    Trans. of Mater. Res. Soc. Jpn. 2002, 27(3), 559–562.

2001

  1. Synthesis and Polymerization of Isopropenyl-1,3,5-triazines Carrying a Long Alkyl Chain with Oxyethylene Spacer and the Side Chains Crystallization of Obtained Comb-like Polymers
    Hideo Kunisada,* Tsuyoshi Ito, Koji Takagi, and Yasuo Yuki
    J. Macromol. Sci., Pure and Appl. Chem. 2001, A38(4), 417–427.
    DOI: 10.1081/MA-100103358
  2. Radical Polymerization of Methyl Methacrylate with Diphenyl Diselenide under Thermal or Photoirradiational Conditions
    Tae Seok Kwon, Kirito Suzuki, Koji Takagi, Hideo Kunisada, and Yasuo Yuki*
    J. Macromol. Sci., Pure and Appl. Chem. 2001, A38(5-6), 591–604.
    DOI: 10.1081/MA-100103592
  3. Synthesis of ABA Type Triblock Copolymers by Radical Polymerization with 1,4-Bis(p-tert-butylphenylselenomethyl)benzene as a Photoiniferter
    Tae Seok Kwon, Koji Takagi, Hideo Kunisada, and Yasuo Yuki*
    J. Macromol. Sci., Pure and Appl. Chem. 2001, A38(5-6), 605–626.
    DOI: 10.1081/MA-100103593
  4. Synthesis of PPV-Based Conjugated Oligomer Containing Tropone in Main Chain
    Koji Takagi,* Yukimi Nishikawa, Hideo Kunisada, and Yasuo Yuki
    Chem. Lett. 2001, (12), 1244–1245.
    DOI: 10.1246/cl.2001.1244

2000

  1. Synthesis of Triazine Dendrimers
    Koji Takagi,* Kazuhito Uchikura, Tatsuya Hattori, Hideo Kunisada, and Yasuo Yuki
    Kobunshi Ronbunshu 2000, 57(10), 646–651.
  2. Synthesis of Macromonomer Using End Functional Polystyrene Prepared from p-Methoxybenzyl p-Trimethylsilylphenyl Selenide as Photoiniferter
    Tae Seok Kwon, Koji Takagi, Hideo Kunisada, and Yasuo Yuki*
    J. Macromol. Sci., Pure and Appl. Chem. 2000, A37(11), 1461–1473.
    DOI: 10.1081/MA-100101165
  3. Synthesis of Branched Polystyrene by Photopolymerization of Selenium-Containing Styrene Monomer
    Koji Takagi,* Yukimi Nishikawa, Tae Seok Kwon, Hideo Kunisada, and Yasuo Yuki
    Polym. J. 2000, 32(11), 970–973.
    DOI: 10.1295/polymj.32.970
  4. Triazine Dendrimers by Divergent and Convergent Methods
    Koji Takagi,* Tatsuya Hattori, Hideo Kunisada, and Yasuo Yuki
    J. Polym. Sci. Part A: Polym. Chem. 2000, 38(24), 4385–4395.
    DOI: 10.1295/polymj.31.411

1999

  1. Radical Polymerization of p-Substituted Styrene with Benzyl Phenyl Selenide as Photoiniferter
    Tae Seok Kwon, Hiromitsu Ochiai, Shuji Kondo, Koji Takagi, Hideo Kunisada, and Yasuo Yuki*
    Polym. J. 1999, 31(5), 411–417.
    DOI: 10.1295/polymj.31.411
  2. Synthesis and Radical Polymerization of p-Phenylselenomethylstyrene and Application to Graft Copolymers
    Tae Seok Kwon, Shuji Kondo, Koji Takagi, Hideo Kunisada, and Yasuo Yuki*
    Polym. J. 1999, 31(6), 483–487.
    DOI: 10.1295/polymj.31.483
  3. Controlled Radical Polymerization of Styrene Utilizing Excellent Radical Capturing Ability of Diphenyl Ditelluride
    Koji Takagi,* Akimasa Soyano, Tae Seok Kwon, Hideo Kunisada, and Yasuo Yuki
    Polym. Bull. 1999, 43(2-3), 143–150.
    DOI: 10.1007/s002890050545

1998

  1. Single-feed One-step Block Copolymerization of n-Octyloxyallene with Phenylallene using pi-Allylnickel as Initiator
    Koji Takagi, Ikuyoshi Tomita, and Takeshi Endo*
    Chem. Commun. 1998, (6), 681–682.
    DOI:10.1039/A708786A
  2. Development and Application of Living Coordination Polymerization of Allene Derivatives by Allylnickel Catalysts
    Ikuyoshi Tomita, Koji Takagi, and Takeshi Endo*
    J. Synth. Org. Chem., Jpn. 1998, 56(4), 260–267.
    DOI: 10.5059/yukigoseikyokaishi.56.260
  3. Living Coordination Polymerization of Alkoxyallenes by pi-Allylnickel Catalyst II –Effect of Anionic Ligands on Polymerization Behavior and Polymer Structure–
    Koji Takagi, Ikuyoshi Tomita, Yoshiyuki Nakamura, and Takeshi Endo*
    Macromolecules 1998, 31(9), 2779–2783.
    DOI: 10.1021/ma9717404
  4. Living Coordination Polymerization of N-Allenylamides by pi-Allylnickel Catalysts
    Koji Takagi, Ikuyoshi Tomita, and Takeshi Endo*
    Macromolecules 1998, 31(20), 6741–6747.
    DOI: 10.1021/ma9800921
  5. Synthesis of Telechelic Polystyrene by Radical Polymerization Using 1,4-Bis(p-tert- butylphenylselenomethyl)benzene as Photoiniferter
    Tae Seok Kwon, Sadanori Kumazawa, Shuji Kondo, Koji Takagi, Hideo Kunisada, and Yasuo Yuki*
    J. Macromol. Sci., Pure and Appl. Chem. 1998, A35(12), 1895–1913
    DOI: 10.1080/10601329808000986
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