Development of external field-responsive conductors based on donor molecules containing stable organic radicals

2018 Fiscal Year Final Research Report

• Project/Area Number: 15K05483
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Functional solid state chemistry
• Research Institution: Osaka Prefecture University
• Principal Investigator: Fujiwara Hideki 大阪府立大学, 理学(系)研究科(研究院), 教授 (70290898)
• Project Period (FY): 2015-04-01 – 2019-03-31
• Keywords: 分子性伝導体 / 伝導性 / 磁性 / 安定有機ラジカル / TTF / 光機能性 / X線構造解析

Outline of Final Research Achievements

To realize external field-responsive functional materials towards external stimuli such as magnetic field and photo-irradiation, we have developed hybrid donor molecules containing stable organic radicals and tetrathiafulvalene (TTF) frameworks. We have cleared the molecular / crystal structures, and magnetic properties of the synthesized hybrid molecules. Furthermore, we have also investigated their photo-functionalities, and found the photo-electric conversion functionalities based on photo-induced formation of charge separated states. On the other hands, we have prepared several cation radical salts of the donors with magnetic transition metal anions. We have cleared the origin of magnetic properties of the obtained cation radical salts by analyzing the magnetic interactions between transition metal d spins, stable organic radicals and π-electrons on TTF framework.

Free Research Field

機能物性化学

Academic Significance and Societal Importance of the Research Achievements

外部刺激に対して高い応答性を示す機能性物質では伝導性や磁性、光機能性などが高速に変化するため、敏感かつ高速に駆動可能な新しい分子性電子デバイス材料開発へと展開できると考えられる。本研究では、そのような分子性材料の開拓に繋がる、安定有機ラジカル部位を分子内に有する複合型ドナー分子の開発に成功している。また、得られた伝導性錯体では各種のスピンが同一結晶内に共存し、互いに強く相互作用しているため、磁場印加によって伝導性が大きく変化する磁性伝導体の開発に繋がる重要な知見が得られたと考えられる。