Controlling the Dual-Emission Character of Aryl-Modified o-Carboranes by Intramolecular CH???O Interaction Sites |
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Authors: | Junki Ochi Kazuhiro Yuhara Prof Kazuo Tanaka Prof Yoshiki Chujo |
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Institution: | Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University Katsura, Nishikyo-ku, Kyoto, 615-8510 Japan |
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Abstract: | 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 CcageH???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. |
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Keywords: | Carboranes Dual emission Fluorescence Hydrogen bonds Thermochromic luminescence |
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