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.