Remote Effect from Boron Cluster: Tunable Photophysical Properties of o-Carborane-Based Luminogens |
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| Authors: | Lihao Guo Xiao Yu Jiahui Du Prof Dr Wei Li Prof Dr Vladimir Bregadze Dr Deshuang Tu Prof Dr Changsheng Lu Prof Dr Hong Yan |
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| Institution: | 1. State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023 P. R. China;2. Institute of Theoretical and Computational Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023 P. R. China;3. A.N.Nesmeyanov Institute of Organoelement Compounds (INEOS), Russian Academy of Sciences, Moscow, 119991 Russia |
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| Abstract: | We proposed a new molecular design strategy that the o-carboranyl group is attached as “an innocent unit” to the remote side of luminogens to tune photophysical properties. To verify this strategy, two o-carborane-based compounds with asymmetric molecular geometry were designed and synthesized. Photophysical properties of o-carborane-based luminogens were investigated on the basis of UV-Vis spectra, photoluminescence spectra, crystal structure analysis and theoretical calculations. The results indicate that the o-carboranyl group has a slight effect on the energy gap between the ground state (S0) and the first excited state (S1) in the solution state but a significant effect on the energy gap between S0 and S1 in the solid state. Besides, the radiative and non-radiative transition processes are modulated by the o-carboranyl unit. This leads to emission quenching in the solution state but an enhanced luminous efficiency in the aggregate state with a typical aggregation-induced emission (AIE) property. |
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| Keywords: | aggregation-induced emission o-carborane remote effect tunable photophysical properties |
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