Ochi Junki, Yuhara Kazuhiro, Tanaka Kazuo, Chujo Yoshiki
Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan.
Chemistry. 2022 Apr 6;28(20):e202200155. doi: 10.1002/chem.202200155. Epub 2022 Mar 8.
It is still challenging to realize a dual-emission system, in which two luminescent bands simultaneously appear by photoexcitation, in solid with organic dyes due to the difficulty in regulation of electronic properties in the excited state and concentration quenching. o-Carborane is known to be a versatile platform for constructing solid-state emitters since the sphere boron cluster is favorable for suppressing intermolecular interactions and subsequently concentration quenching. Here, we show solid-state dual-emissive o-carborane derivatives. We prepared 4 types of o-carborane derivatives and found dual-emission behaviors both in solution and solid states. By regulating the rotation at the o-carborane unit with the intramolecular C H⋅⋅⋅O interaction, the dual-emission intensity ratios were changed. Finally, it was demonstrated that the overall photoluminescence spectra can be estimated using the binding energy of intramolecular interactions.
由于激发态电子性质调控困难以及浓度猝灭问题，在含有有机染料的固体中实现双发射系统（即通过光激发同时出现两个发光带）仍然具有挑战性。由于球形硼簇有利于抑制分子间相互作用并进而抑制浓度猝灭，邻碳硼烷是构建固态发光体的通用平台。在此，我们展示了固态双发射邻碳硼烷衍生物。我们制备了4种邻碳硼烷衍生物，并在溶液和固态中均发现了双发射行为。通过分子内C—H⋅⋅⋅O相互作用调节邻碳硼烷单元的旋转，双发射强度比发生了变化。最后，证明了可以使用分子内相互作用的结合能来估算整体光致发光光谱。
