Control of Charge Arrangement and Electronic Phase Transition in Molecular Crystals

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05448
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 32020:Functional solid state chemistry-related
• Research Institution: Kyoto University
• Principal Investigator: Yamochi Hideki 京都大学, 理学研究科, 名誉教授 (20182660)
• Co-Investigator(Kenkyū-buntansha): 大塚 晃弘 京都大学, 理学研究科, 准教授 (90233171)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 電荷配列 / 分子性結晶 / 電子相転移 / 導電性 / 磁性

Outline of Final Research Achievements

The aim of this project was to construct the designing principles and the real substances for the functional molecular solids. This project succeeded in synthesizing the molecular conductor which simultaneously exhibits a metallic conductivity and single molecule magnet behavior by employing the well-recognized nature of known compounds. This study also examined the rarely applied concept of using (radical)anions of weak electron acceptor molecules which provided new metalloporphyrins, metallophthalocyanines and related metal-coordinated molecular (radical)anion species. The magnetic interactions within and between the coordination complex anions were thoroughly studied, including the revelation of the temperature-dependent spin quantum number, S.
This study has provided the unique molecular solids and the suggestive ideas to advance the fundamental sciences of materials.

Free Research Field

分子性物質化学

Academic Significance and Societal Importance of the Research Achievements

本研究では成分分子に関する既知の特性を活かした新規導電性・磁性共存物質の開拓を行ったのみならず、電子受容性の弱い分子について前例の少ない(ラジカル)陰イオンとした状態での機能性物質の開拓が行われた。これらの研究指針は従来の物質開拓指針には欠けていた発想をも含み、その結果は機能性を持つ分子性結晶の開拓研究において新たな方法論を提示している。これらの成果から得られた知見は短期的に実用材料を産出するものではないが、固体物性科学分野における新たな基礎科学的な情報と物質設計指針の例を与えている。