Two d10 Metal Coordination Polymers Based on 1H-1,2,4-Triazole: Synthesis, Structure and Fluorescence

摘要

The reactions of 1H-1,2,4-triazole (Htr) with MX2 (ZnCl2 for 1; CdBr2 for 2) resulted in two coordination polymers, [Zn(tr)Cl]n (1) and [Cd(Htr)2Br2]n (2). The structural analyses indicate that 1 and 2 feature a 2D layer and 1D triple chain, respectively. In 1, neighouring Zn atoms are connected by μ3-1 κN: 2 κN: 4 κN-tr− anionic ligand into 6- and 16-membered rings, further grow into a 2D sheet. Cd atoms in 2 are bonded by two μ2-Br− bridges and neutral μ2-1 κN: 2 κN-Htr to form a 1D triple chain. The fluorescent characterizations of 1, 2 and the free Htr ligand feature simlilar emission peakes at 444, 446 and 423 nm respectively, which can be assigned to intra-ligand π-π * transition of (H)tr. The energy gaps of 5.90 eV for 1, 5.16 eV for 2, and 5.93 eV for Htr suggest that the compounds behave as insulators.