Exploring new solid-state photochromism of spiropyranes

2015 Fiscal Year Final Research Report

• Project/Area Number: 24550041
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Organic chemistry
• Research Institution: The University of Tokyo
• Principal Investigator: OGAWA Keiichiro 東京大学, 総合文化研究科, 教授 (50114426)
• Co-Investigator(Kenkyū-buntansha): HARADA Jun 北海道大学, 理学(系)研究科(研究院), 准教授 (00313172)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: フォトクロミズム / スピロピラン / スピロオキサジン / クロメン / 固相光反応

Outline of Final Research Achievements

Spiropyrans and spirooxazines have long been believed to photochromic only in solutions and in polymers, and non-photochromic in the solid state. We have shown that chromenes as well as spiropyrans and spirooxazines are generally photochromic even in the solid state and that their photoreactivity increases greatly as the temperature is lowered. In the solid-state photochromism of chromenes, in addition to stable planar merocyanine forms, unstable colored species, which are tentatively assigned to the non-planar cisoid-cisoid form, were observed.

Free Research Field

有機物理化学、有機結晶化学