Study on Soft Magnetism of Amorphous Solids Composed of Stable Phenoxyl Radicals

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K05019
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 33010:Structural organic chemistry and physical organic chemistry-related
• Research Institution: University of Toyama
• Principal Investigator: Hayashi Naoto 富山大学, 学術研究部理学系, 教授 (90281104)
• Co-Investigator(Kenkyū-buntansha): 吉野 惇郎 富山大学, 学術研究部理学系, 助教 (70553353)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: アモルファス固体 / フェノキシルラジカル / ２量化平衡 / 磁化率測定

Outline of Final Research Achievements

In order to investigate the influence of molecular structure on solidification behavior and composition in amorphous solids consisting of a stable radical and its covalent dimer, stabilized phenoxyl radicals with different numbers of tert-butyl (tBu) groups were synthesized and their solidification behavior and solid structure were investigated. A correlation was found between the facility of amorphous solidification from solution and the number of tBu groups, whereas no correlation was found for solid-phase grinding of dimeric crystals. Comparison of magnetic susceptibility measurements and exchange experiments between amorphous pseudopolymorphs of different compositions revealed that amorphous solids are composed of clusters containing a certain ratio of radicals and dimers as the basic unit, with various guest components incorporated between them.

Free Research Field

有機化学

Academic Significance and Societal Importance of the Research Achievements

固体機能発現においては、分子そのものの機能だけでなく、その結晶構造が重要な意味を持つ。本研究では、ラジカル分子からなるアモルファス固体を調製し、その組成や配列を適切に制御することで分子間に軟質磁性が発現するような相互作用を持たせるという研究の最終目的の基盤とすべく、分子構造がアモルファス形成挙動やアモルファス固体の組成に及ぼす影響を調べ、クラスターの存在や、そのクラスターがホストとしてゲスト成分を取り込みうることを明らかとした。これらの知見は、今後のアモルファス固体中でスピン濃度を高め、またスピン間での適切ね相互作用を発現させるための重要な指針となる。