研究者業績

竹岡 裕子

タケオカ ユウコ  (Takeoka Yuko)

基本情報

所属
上智大学 理工学部物質生命理工学科 教授
学位
博士(工学)(東京大学)

J-GLOBAL ID
200901054354018811
researchmap会員ID
5000041377

論文

 216
  • D. Hishida, T. Chowdhury, R. Shimono, A. Saeki, G. Uzurano, A. Fujii, M. Yoshizawa-Fujita, M. Rikukawa, Y. Takeoka
    ACS Appl. Energy Mater. 2025年3月  査読有り責任著者
  • Noriyuki Suzuki, Kanata Okajima, Daijiro Takayama, Bjarne L. Silkenath, Zheng Yang, Yuko Takeoka, Masahiro Rikukawa
    Current Organocatalysis 12 2025年1月8日  
    Background: Developing environmentally benign processes, such as organic reactionsconducted in water, is desired from the view of sustainable technology. Concerning the palladiumcatalyzedborylation reactions of aryl halides in water, only a few examples have been reported. Objective: This study aimed to develop efficient methods for palladium-catalyzed borylation reactionsof aryl halides in water, not only increasing product yields but also extracting products withless organic solvents. Methods: We adopted polymer surfactants, such as diblock copolymers that consist of poly(Nisopropoylacrylamide)and a hydrophilic segment, and a poly(ethylene glycol)-based polymer thatconsists of poly(ethylene glycol) chain and 4-chloromethylbenzyl moiety. Results: Reactions using these polymers gave the borylation products in significantly higher yieldsthan that in pure water. The efficiency of the extraction process for the products from the reactionmixtures was evaluated, indicating that the polymer micelles enabled separation processes with lessorganic solvent. Conclusion: Applying polymer surfactants increased the product yields in Pd-catalyzed borylationof aryl halides, and it enabled the extraction of the products from the aqueous reaction mixture moreefficiently.
  • Noriyuki Suzuki, aNozomuEbara, a, Rikito Arai, a, Chirika Takahashi, Tsai-Yu Hung, Yuko Takeoka, Masahiro Rikukawa, Yukie Yokota, aandFu-Yu Tsai
    Catalysis Science & Technology 15 696 2025年  査読有り
  • Yoshifumi Hirotsu, Ryotaro Sekiguchi, Yuko Takeoka, Masahiro Rikukawa, Masahiro Yoshizawa-Fujita
    Bulletin of the Chemical Society of Japan 97(10) 2024年10月  
    Despite being safe for use in secondary Mg batteries, solid electrolytes exhibit lower ionic conductivities than those of traditional liquid electrolytes. Organic ionic plastic crystals-soft crystals with excellent thermal and electrochemical stabilities and ionic conductivities-are promising solid electrolytes. Herein, we investigated the effects of various anion species and Mg salt concentrations on the properties of pyrrolidinium-based organic ionic plastic crystals (N,N-diethylpyrrolidinium bis(fluorosulfonyl)amide [[C2epyr][FSA]] and N,N-diethylpyrrolidinium bis(trifluoromethylsulfonyl)amide [[C2epyr][TFSA]]) upon Mg(TFSA)2 addition. The Mg-ion transference number (tMg2+) was measured using the Vincent-Bruce method; ionic conductivity via impedance measurements; and phase transition via differential scanning calorimetry. The phase transition behavior, dissociation state of the Mg salt, and electrochemical properties varied with the organic ionic plastic crystal anionic structure. The FSA system became liquid when the Mg salt concentration exceeded 15 mol%. The ionic conductivity of the pyrrolidinium-based organic ionic plastic crystals increased substantially with the Mg salt concentration. In the solid state, [C2epyr][FSA]/Mg(TFSA)2 (5 mol%) (FT5) showed the highest ionic conductivity (2.9 × 10−4 S cm−1 at 25 °C). The tMg2+ of FT5 at 60 °C was 0.29. Mg exhibited redox behavior in FT5 but not in [C2epyr][TFSA]/Mg(TFSA)2 (5 mol%). The FSA− structure is suitable for Mg electrochemistry and will aid in developing high-performance secondary Mg batteries.

MISC

 13

書籍等出版物

 13

主要な講演・口頭発表等

 287

共同研究・競争的資金等の研究課題

 5

社会貢献活動

 8

メディア報道

 4