Development of Meltable and Self-Healing Coordination Polymers Containing Ionic Liquid Components

• Project/Area Number: 20K21210
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 34:Inorganic/coordination chemistry, analytical chemistry, and related fields
• Research Institution: Kobe University
• Principal Investigator: Mochida Tomoyuki 神戸大学, 理学研究科, 教授 (30280580)
• Co-Investigator(Kenkyū-buntansha): 桑原 大介 電気通信大学, 研究設備センター, 准教授 (50270468) ; 藤森 裕基 日本大学, 文理学部, 教授 (80297762)
• Project Period (FY): 2020-07-30 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000); Fiscal Year 2021: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000); Fiscal Year 2020: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
• Keywords: イオン液体 / 配位高分子

Outline of Research at the Start

配位高分子は優れた機能材料として知られるが、通常の高分子材料とは異なり、一般に融解せず、可塑性・加工性に欠ける。そこで本課題では、イオン液体を素材として、柔軟性を持つ低融点配位高分子を開発する。さらに、この系の特性を利用して、自己修復能を持つ配位高分子膜の形成に挑戦する。こうして配位高分子錯体の新しい可能性・展開性を拓く。

Outline of Final Research Achievements

The aim of this study is to develop meltable coordination polymers using ionic liquids. A series of anionic coordination polymers containing ionic liquid cations were synthesized by the reaction of ionic liquids and salts containing cyanide anions. These materials exhibited incongruent melting, and the mechanism was elucidated spectroscopically. Most of the coordination polymers vitrified upon rapid cooling from the molten state. The observed melting trends and vitrification conditions depended on the cation structure in the materials.

Academic Significance and Societal Importance of the Research Achievements

近年、融解する配位高分子がいくつか報告され、それらは加工性やガラス形成能の点で注目されている。本研究では、イオン液体を用いて低融点配位高分子を合成する方法論を開拓し、多成分からなる配位高分子における不一致融解現象の一般性を示した。これらの結果は、低融点配位高分子の物質設計およびガラス化能制御の指針として、今後の機能性配位高分子開発に有用である。

Research Products

• [Journal Article] Incongruent Melting and Vitrification Behaviors of Anionic Coordination Polymers Incorporating Ionic Liquid Cations (2022)
  • Author(s): Mochida Tomoyuki、Qiu Yi、Sumitani Ryo、Kimata Hironori、Furushima Yoshitomo
  • Journal Title: Inorganic Chemistry Volume: 61 Issue: 36 Pages: 14368-14376
  • DOI: 10.1021/acs.inorgchem.2c02147
  • Peer Reviewed / Open Access
• [Journal Article] Ionic liquid-containing coordination polymer: solvent-free synthesis, incongruent melting, and glass formation (2022)
  • Author(s): Mochida Tomoyuki、Qiu Yi、Funasako Yusuke、Inokuchi Makoto、Noguchi Mariko、Fujimori Hiroki、Furushima Yoshitomo
  • Journal Title: Chemical Communications Volume: 58 Issue: 47 Pages: 6725-6728
  • DOI: 10.1039/d2cc01375d
  • Peer Reviewed / Open Access
• [Presentation] Rhodium-Containing Ionic Liquid for the Solvent-Free Formation of Coordination Polymers (2023)
  • Author(s): 角谷凌, 持田智行
  • Organizer: 日本化学会第103春季年会
• [Presentation] Construction of Amorphous Coordination Polymers From Liquid Metal Complexes (2023)
  • Author(s): T. Mochida, R. Sumitani
  • Organizer: 8th Asian Conference on Coordination Chemistry
  • Int'l Joint Research / Invited
• [Presentation] Ionic Liquid Derivatives Containing Photoreactive Organometallic Cations: Reversible Transformation into Coordination Polymers in Response to External Stimuli (2021)
  • Author(s): T. Mochida, R. Sumitani
  • Organizer: 6th Iberoamerican Meeting on Ionic Liquids
  • Int'l Joint Research / Invited
• [Presentation] イオン液体の光反応によって配位高分子を創る (2020)
  • Author(s): 持田智行
  • Organizer: ラドテック研究会 第168回講演会
  • Invited