Three distinct cadmium coordination polymers with a multidentate tripyridyl-substituted triazole tecton regulated by halide anions

Three distinct Cd(II) coordination polymers [Cd3(L434)2Cl6]n (1), [Cd(L434)2Br2]n (2), and [Cd2(L434)2I4(H2O)2]n (3) have been designed and synthesized with a versatile building block 3,5-bis(4-pyridyl)-4-(3-pyridyl)-1,2,4-triazole (L434) by altering the Cd(II) halides of reaction systems. Single crystal X-ray diffraction reveals that 1-3 display different zigzag, box-like, and ladder-like 1D polymeric motifs, respectively. Moreover, aromatic stacking interactions are observed in all these structures to extend and/or stabilize the supramolecular lattices. Their thermal stabilities and fluorescent properties have also been explored. Significantly, the regular variation in structural patterns and photoluminescence properties of 1-3 can be properly ascribed to the diversification of halide anions.