Yuhara Kazuhiro, Tanaka Kazuo
Department of Polymer Chemistry Graduate School of Engineering, Kyoto University Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan.
Chemistry. 2023 Aug 4;29(44):e202301189. doi: 10.1002/chem.202301189. Epub 2023 Jul 6.
Luminochromic behaviors regarding mechanochromic luminescence (MCL) of o-carborane-modified anthracene derivatives are reported. We have previously synthesized bis-o-carborane-substituted anthracene and found that its crystal polymorphs show dual-emission properties composed of excimer and charge transfer (CT) emission bands in the solid state. Initially, we observed the bathochromic MCL behavior from 1 a originating from emission mechanism alteration from dual emission to CT emission. By inserting the ethynylene spacers between anthracene and o-carboranes, compound 2 was obtained. Interestingly, 2 showed hypsochromic MCL originating from the emission mechanism alteration from CT to excimer emission. Furthermore, luminescent color of ground 1 a can be recovered to the initial state by allowing to stand at room temperature, meaning that self-recovery proceeds. Detailed analyses are described in this study.
报道了邻碳硼烷修饰的蒽衍生物的机械变色发光（MCL）的光致变色行为。我们之前合成了双邻碳硼烷取代的蒽，并发现其晶体多晶型物在固态下表现出由准分子和电荷转移（CT）发射带组成的双发射特性。最初，我们观察到1 a的红移MCL行为，这源于发射机制从双发射转变为CT发射。通过在蒽和邻碳硼烷之间插入乙炔间隔基，得到了化合物2。有趣的是，2表现出蓝移MCL，这源于发射机制从CT发射转变为准分子发射。此外，将1 a置于室温下静置，其基态发光颜色可恢复到初始状态，这意味着自恢复过程得以进行。本研究中描述了详细的分析。
