External Field Responsiveness and Dynamic Function in Low-Dimensional Metal Complexes with Flexible Proton-Electron States

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05537
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 34010:Inorganic/coordination chemistry-related
• Research Institution: University of Tsukuba
• Principal Investigator: SHIGA Takuya 筑波大学, 数理物質系, 准教授 (00375411)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 双安定性 / 磁性 / プロトン / 電子 / 鉄錯体 / 水素結合 / 脱溶媒 / 圧力熱量効果

Outline of Final Research Achievements

Bistable metal complexes with multiple stable states can be precisely designed to have a variety of electronic states by modifying the ligands and controlling the molecular assembly structure. The objective of this study is to develop functional molecular compounds with a new physical property conversion mechanism in which the electronic states of bistable metal complexes are correlated with the dynamic behavior of protons. Molecular modification of mononuclear iron spin-crossover complexes with multi-step proton desorption was investigated, and multi-step spin-crossover behavior changes with desorption of solvent molecules and giant pressure response were found through hydrogen bonding interactions.

Free Research Field

錯体化学

Academic Significance and Societal Importance of the Research Achievements

熱や光による物性変換は数多く報告されているが、プロトンに起因した双安定性の発現や電場応答性の研究は皆無であり、本研究の成果をもとに適切な分子選択・分子修飾を行うことで、プロトンに関連した相互作用に連動する新しい外場応答性を持つ機能性分子材料を開発できると考えられる。これらの分子材料は、多重双安定性物質や圧力熱量効果材料などへの応用が期待でき、分子性機能性材料研究において重要な知見を与えるものと考えられる。