Ochi Junki, Tanaka Kazuo, Chujo Yoshiki
Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan.
Angew Chem Int Ed Engl. 2020 Jun 15;59(25):9841-9855. doi: 10.1002/anie.201916666. Epub 2020 Apr 1.
o-Carborane, a cluster compound containing boron and adjacent carbon atoms, displays intriguing luminescent properties. Recently, compounds containing o-carborane units were found to show suppressed aggregation-induced quenching and intense solid-state emission; they also show potential for the development of stimuli-responsive luminochromic materials. In this Minireview, we introduce three kinds of fundamental photochemical properties: aggregation-induced emission, twisted intramolecular charge transfer in crystals, and environment-sensitive excimer formation in solids. Based on these properties, several types of luminochromism, such as thermos-, vapo-, and mechanochromism, have been discovered. Based mainly on results from recent studies, we illustrate these mechanisms as well as unique luminescent behaviors of o-carborane derivatives.
邻碳硼烷是一种含有硼和相邻碳原子的簇状化合物，具有引人注目的发光特性。最近，人们发现含有邻碳硼烷单元的化合物表现出抑制的聚集诱导猝灭和强烈的固态发射；它们还显示出刺激响应性发光变色材料的开发潜力。在这篇综述中，我们介绍了三种基本的光化学性质：聚集诱导发光、晶体中的扭曲分子内电荷转移以及固体中的环境敏感准分子形成。基于这些性质，已经发现了几种类型的发光变色现象，如热致变色、气致变色和机械变色。主要基于最近的研究结果，我们阐述了这些机制以及邻碳硼烷衍生物独特的发光行为。
