Synthesis, Crystal Structure and Luminescent Property of a Dinuclear Cadmium Complex Based on 2-(2-(1H-Benzodimidazol-2-yl)-phenyl)-1-phenyl-1H-benzo d imidazole

摘要

A dinuclear cadmium complex [Cd2(bppb)Cl4.2DMF] (1),where bppb is 2-(2-(1H-benzo[d]imidazol-2-yl)phenyl)-1-phenyl-1H-benzo[d]imidazole,was synthesized and characterized by X-ray single-crystal structure analyses.For 1:C58H50Cd2Cl4N10O2,Mr =1285.68,monoclinic system,space group P21,a =16.136(3),b =10.612(2),c =16.270(3) (A),β =96.209(2)°,V =2769.7(9) (A)3,Z =2,Dc =1.542 g/cm3,λ =0.71073 (A),μ(MoKa) =1.013 mm-1,F(000) =1296,S =1.055,R =0.0393 and wR =0.1185 for 4876 observed reflections with I ＞ 2σ(I).One 2-(2-(1H-benzo[d]imidazol-2-yl)phenyl)-1-phenyl-1H-benzo[d]imidazole coordinates to one cadmium ion which is five-coordinated by three chloride ions and two nitrogen atoms from bppb.Two cadmium ions are bridged by two chloride ions.The Cd2(bppb)2Cl2(μ-Cl2) decomposes at 350 ℃ which is much lower by 70 ℃ than [Cd2(bpbb)2Cl2(μ-Cl2)] (420 ℃).The complex emits blue luminescence in both DMF solution and solid powder.Phenyl ring substituting NH hydrogen atom of benzimidazole group in ligand can not obviously change the UV-vis and luminescence spectra peaks location of the benzimidazole cadmium complex.