Development of Novel Physical Properties of Supramolecular Charge Separation Compounds Containing Soft Matter Characters

2023 Fiscal Year Final Research Report

• Project/Area Number: 20H01862
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: Osaka University
• Principal Investigator: Nakazawa Yasuhiro 大阪大学, 大学院理学研究科, 教授 (60222163)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 電荷分離 / 微少量試料 / 熱容量 / 誘電特性 / 磁気特性

Outline of Final Research Achievements

In this study, novel physical properties inherent in molecular compounds consisting of cationic and anionic framework units with relatively large cluster charges and spatial extent or charge-transfer complexes consisting of donor and acceptor molecules stacked in segregated structures. The large cationic or anionic frameworks tend to form interstitial space which gives local and non-equilibrium dynamics of counter ions and small molecules like water. The physical properties such as permittivity and thermal conductivity, heat capacity and magnetic susceptibility were measured in a wide temperature region. We also studied charge-disproportionation-induced glassy states of phonons in several materials with frustrated structure.

Free Research Field

物性熱力学

Academic Significance and Societal Importance of the Research Achievements

本研究目的達成のため、大量合成が困難な極微単結晶試料や分子性複合塩の粉末試料に対して、広い温度領域や外場環境下で、その誘電、磁気、熱物性の測定を進めるための技術開発を進めることで、分子性化合物の物性測定の可能性を広げることが出来た。また、電荷の分離が駆動力として働く分子性物質では、硬い固体結晶の中であっても電荷の不均衡によってつくられる局所空間や間隙に分子の動的構造からくる柔らかい系としての特徴があることがわかった。二面性をもつ新たな凝集相の概念の構築に繋がる学術的な意義がある。