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Xu, Liang‐Jin; Plaviak, Anna; Lin, Xinsong; Worku, Michael; He, Qingquan; Chaaban, Maya; Kim, Bumjoon J.; Ma, Biwu
Angewandte Chemie International Edition, December 14, 2020, Letnik: 59, Številka: 51Journal Article
The photophysical tuning is reported for a series of tetraphenylphosphonium (TPP) metal halide hybrids containing distinct metal halides, TPP2MXn (MXn=SbCl5, MnCl4, ZnCl4, ZnCl2Br2, ZnBr4), from efficient phosphorescence to ultralong afterglow. The afterglow properties of TPP+ cations could be suspended for the hybrids containing low band gap emissive metal halide species, such as SbCl52− and MnCl42−, but significantly enhanced for the hybrids containing wide band gap non‐emissive ZnCl42−. Structural and photophysical studies reveal that the enhanced afterglow is attributed to stronger π–π stacking and intermolecular electronic coupling between TPP+ cations in TPP2ZnCl4 than in the pristine organic ionic compound TPPCl. Moreover, the afterglow in TPP2ZnX4 can be tuned by controlling the halide composition, with the change from Cl to Br resulting in a shorter afterglow due to the heavy atom effect. Zero‐dimensional Ph4P+ (TPP+) metal halide hybrids have been developed to exhibit distinct photophysical properties, from highly efficient phosphorescence to ultralong afterglow. The afterglow properties of Ph4P+ cations could be suspended for the hybrids containing low band gap emissive metal halide species, such as SbCl52− and MnCl42−, but enhanced for the hybrid containing wide band gap non‐emissive ZnCl42−.
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