Du Xianchao, Yuan Mao-Sen, Xu Fan, Wang Hui, Wang Qin, Wang Wenji, Wang Dong-En, Wang Jinyi
College of Science, Northwest A&F University, Yangling 712100, PR China.
College of Science, Northwest A&F University, Yangling 712100, PR China; State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2016 Jul 5;164:33-9. doi: 10.1016/j.saa.2016.03.046. Epub 2016 Apr 5.
C3-symmetric truxene and triindole have been widely used to design the branched optoelectronic molecules. However, most of them exhibit high luminous efficiency in the solution and quenched luminescence in the solid state. Here, we respectively chose alkylated truxene and triindole as the central core, 2-methylphenyl as the peripheral functional groups to synthesize three branched compounds. Their photophysical properties have been explored combining with the theoretical calculation. The three compounds exhibit good solubility and high solid-state fluorescence quantum yields. The absorption and emission peaks of triindole compound exhibit apparent red-shift in comparison with those of truxene compounds, which indicates triindole more highly electron delocalization than truxene. The single-crystal structure shows that alkylation of the central core and branched steric bulkiness of these molecules effectively reduce the intermolecular π⋯π stacking and avoid the non-radiative transition of these molecules from excited state to ground state in the solid state.
C3对称的并四苯和三吲哚已被广泛用于设计支化光电分子。然而，它们中的大多数在溶液中表现出高发光效率，而在固态时发光猝灭。在此，我们分别选择烷基化的并四苯和三吲哚作为中心核，2-甲基苯基作为外围官能团来合成三种支化化合物。结合理论计算对它们的光物理性质进行了探索。这三种化合物表现出良好的溶解性和高固态荧光量子产率。与并四苯化合物相比，三吲哚化合物的吸收峰和发射峰呈现明显的红移，这表明三吲哚比并四苯具有更高的电子离域程度。单晶结构表明，中心核的烷基化以及这些分子的支化空间位阻有效地减少了分子间的π⋯π堆积，并避免了这些分子在固态时从激发态到基态的非辐射跃迁。
