Department of Chemistry, School of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan.
Chem Commun (Camb). 2019 Jan 24;55(9):1221-1224. doi: 10.1039/c8cc09591d.
We herein report a novel biphotochromic molecule composed of two fast negative photochromic phenoxyl-imidazolyl radical complex units showing incident light intensity dependence of the photochemical reaction. The electronic coupling between the two fast negative photochromic units gives a non-linear photoresponse; weak- and intense-visible light irradiation proceed the one-photon and two-photon photochemical reactions, respectively. The solution of the stepwise negative photochromic molecule changes to colorless only by excitation with intense visible light.
我们在此报告了一种新型双光致变色分子，由两个快速负光致变色的苯氧-咪唑基自由基络合物单元组成，表现出对入射光强度的光化学反应依赖性。两个快速负光致变色单元之间的电子耦合产生了非线性光响应；弱光和强光可见光辐照分别进行单光子和双光子光化学反应。只有用强光激发，逐步负光致变色分子的溶液才会变成无色。
