To obtain solid‐state emissive materials having stimuli‐responsive luminescent chromic properties without phase transition, benzobithiophenes modified with two o‐carborane units having various substituents in the adjacent phenyl ring in o‐carborane were designed and synthesized. Their emission colors were strongly affected not only by the substituents at the para‐position of the phenyl ring but also by molecular distribution in the solid state. In particular, the emission colors were changed by heating without crystal phase transition. It was proposed that their thermochromic properties were correlated not with isomerization but with the molecular motion at the distorted benzobithiophene moiety.

中文翻译：

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基于双（邻-甲硼烷）取代的苯并二噻吩结构的热致变色染料的设计

为了获得具有激发响应的发光致变色特性而无相变的固态发光材料，设计并合成了邻二甲烷中相邻两个苯环上具有多个取代基的两个邻甲碳烷单元改性的苯并联噻吩。它们的发射颜色不仅受到苯环对位的取代基的强烈影响，还受到固态分子分布的强烈影响。特别地，通过加热而没有结晶相变来改变发光颜色。有人提出，它们的热致变色特性与异构化无关，而与在扭曲的苯并二噻吩部分处的分子运动有关。