Design of porous conductive molecular magnets establishing synergistic reversibility between chemical stimuli and physical properties

2018 Fiscal Year Final Research Report

• Project/Area Number: 16H02269
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Functional solid state chemistry
• Research Institution: Tohoku University
• Principal Investigator: Miyasaka Hitoshi 東北大学, 金属材料研究所, 教授 (50332937)
• Research Collaborator: Kosaka Wataru
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 多孔性配位高分子 / 多孔性導電性磁石 / ガス吸着挙動 / 磁性変換 / 動的スピン / スポンジ磁石 / 酸素磁性

Outline of Final Research Achievements

The research project aimed to design molecular lattice compounds that undergo drastic changes of their physical properties such as electronic conductivity and magnetism due to the influence of chemical stimuli. The chemical stimuli were assumed as insertion/extraction of guest molecules such as solvent molecules and ubiquitous gas molecules, for which porous conductive magnets with lattice frameworks were rationally established based on the previous studies. Focusing on lattices that undergo the dynamical change of charge ordered state derived by a small modulation of structures, charge-flexible lattices were, in particular, synthesized by tuning HOMO/LUMO energy levels of electron-donor/-acceptor building units. Consequently, some characteristic materials such as magnetic sponges undergoing electronic modulations or porous magnets distinguishing electron spins of oxygen molecules were established.

Free Research Field

錯体化学・機能物性化学

Academic Significance and Societal Importance of the Research Achievements

化学物質を吸脱着させて、その情報を伝導性や磁性などのバルク物性の変化として捉えることができる材料は極めて珍しく、近年の分子多孔性材料でもほとんどないのが現状である。特に、電子状態や磁性相を劇的に変換する材料はこれまでに報告例はなく、今回の材料は社会的にも極めてインパクトがある（幾つかはプレスリリースを行った）。これらの材料は、環境問題などに対する小分子分析技術はもとより、複数の化学物質の構成で信号を得る（化学言語）のような新しい技術にも繋がると予想される。即ち、吸着した物質は何か、どのくらいの量か、組成は？など、材料の物性がそのまま情報を発信する新しい多孔性分子材料が創造できるのである。