Study of the dynamics of photo-excited high-spin pai-radicals toward molecular spintronics

2015 Fiscal Year Final Research Report

• Project/Area Number: 24350076
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Functional materials chemistry
• Research Institution: Osaka City University
• Principal Investigator: Teki Yoshio 大阪市立大学, 大学院理学研究科, 教授 (00180068)
• Co-Investigator(Kenkyū-buntansha): HIROTSU MASAKAZU 大阪市立大学, 大学院理学研究科, 准教授 (30312903) ; ITO AKITAKA 大阪市立大学, 大学院理学研究科, 助教 (20708060)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: 光励起状態 / スピンダイナミックス / πラジカル / 光耐久性 / ペンタセン / 高スピン状態 / 原子価互変異性 / スピントロニクス

Outline of Final Research Achievements

In this project, the following scientific achievements were obtained. A new photo-stabilization method of acene derivatives utilizing stable radical was discovered. Thus, a combination of two unstable species (photo-reactive pentacene and radical) led to remarkable photo-stability enhancement and the solubility enhancement in organic solvents. To clarify the mechanism of the photo-stability enhancement, excited-state dynamics of the pentacene derivatives having stable radical substituents were investigated by using the transient absorption measurements. The derivatives showed ultrafast formation of triplet excited state in the pentacene moiety from photoexcited singlet state owing to the contributions of enhanced intersystem crossing and singlet fission.
In addition, we also obtained some new results concerned with the excited-state spin dynamics of radicals. Furthermore, the magnetic and optical properties of Co complexes with radical ligands were also investigated.

Free Research Field

スピン科学