Creation and mechanistic elucidation of unique properties of coordination polymers with inclusion molecule as a variable

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01905
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 32020:Functional solid state chemistry-related
• Research Institution: Kyushu University
• Principal Investigator: Ohba Masaaki 九州大学, 理学研究院, 教授 (00284480)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 多孔性金属錯体 / 配位高分子 / MOF / 磁気特性 / 発光特性 / ゲスト応答性 / 包接体

Outline of Final Research Achievements

The aim of this project was to achieve a dynamic coupling between the behaviour of molecules confined in the interior of porous coordination polymers (MOFs) and the magnetic or luminescent properties incorporated in the framework, and to elucidate these mechanisms.
Original in situ measurement systems for magnetism, powder X-ray diffraction, emission spectra, Raman and IR spectra under pressure-controlled guest atmospheres were established and detailed measurements were used to (1) clarify the behaviour of guest molecules in the pores of Hofmann type MOFs {Fe(pz)[Pt(CN)4]} and their correlation with magnetic properties, and (2) the development of guest-responsive luminescent MOFs using the luminescent building block [ReN(CN)4]2- and the correlation between guest adsorption/desorption and luminescent properties.

Free Research Field

錯体化学

Academic Significance and Societal Importance of the Research Achievements

本研究では、多孔性配位高分子 MOFs の構造内にゲスト分子を取り込んだ「分子包接体」において、ゲスト分子の吸脱着ならびに細孔内挙動に応答した物性変換や既存の材料にはないユニークな物性の発現を目指した。多孔性構造と磁性または発光特性を兼ね備えるMOFsを開発し、ゲスト分子の吸脱着、ならびに細孔内におけるゲスト分子の運動、配列や相変化と物性との相関を系統的に研究した。ゲスト分子の細孔内での運動に連動した「多段階のスピン状態変化」、ゲスト分子に応答した可逆的な「磁気相」、「結晶－アモルファス相」、「発光特性」などの変化と相関機構の解明に成功し、分子包接体の物性科学の深化に貢献した。