Abstract
Triangular three-coordinated copper(I) halide complexes (1 (I), 2 (Br)) were developed based on a rigid bidentate P-donor ligand functionalized with electron-deficient pyridoimidazole moiety. The results of the temperature-dependent spectroscopic properties reveal that both Cu(I) complexes in crystalline powder at 298 K achieve orange thermally activated delayed fluorescence (TADF) with high photoluminescence quantum yields of 77% for 1 and 56% for 2, and microsecond lifetimes of 55.1 μs (1) and 73.5 μs (2), respectively. Additionally, aromatic CH···π interactions in molecular packing structures constitute an appealing class of crystallization-induced emission enhancement (CIEE) complexes. The results suggest that such highly efficient copper-based stimuli-responsive materials are beneficial for a broad range of applications.
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