Development of polarization switching material using electron transfer

2023 Fiscal Year Final Research Report

• Project/Area Number: 20H00385
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Medium-sized Section 34:Inorganic/coordination chemistry, analytical chemistry, and related fields
• Research Institution: Kyushu University
• Principal Investigator: Sato Osamu 九州大学, 先導物質化学研究所, 教授 (80270693)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 電子移動

Outline of Final Research Achievements

Polarization-switching materials have a wide range of applications including memory and sensors. We developed new polarization-switching cobalt valence tautomeric complexes. The cobalt complexes crystalize in a polar structure and exhibit intramolecular electron transfer at approximately 190 K. They also exhibit photoinduced electron transfer and that the photoinduced metastable state is trapped at low temperatures. These results suggest that the cobalt complexes exhibit thermal- and photo-induced polarization switching, the mechanism of which is electron transfer between Co and ligand.

Free Research Field

光化学

Academic Significance and Societal Importance of the Research Achievements

温度、及び光誘起電子移動を利用して電気分極を制御できる新しい物質を開発した。将来のメモリー、センサ ー、エネルギー変換素子への応用が期待される。これまでの分極制御物質開発は強誘電体開発を中心に研究が行われてきた。本研究では、電子移動機構を積極的に導入することで非強誘電体において強誘電体と同レベルの分極変化を実現できることを明らかにした。本手法を用いることで今後高性能の新しい機能性分極制御物質を開発できる可能性がある。