Syntheses, Crystal Structures and Properties of Two Coordination Polymers Based on Bisbenzimidazole

Two novel coordination polymers Bim(C=O)CuI](1) and[Bim(C=O)CdCl](2) based on the flexible ligand bis(1H-benzo[d]imidazol-2-yl)methane (Bim) were synthesized via volatilization method.They crystalize in monoclinic and triclinic crystal systems and adopt space group of P2/c and P1,respectively.The compounds were characterized by elemental analysis,infrared spectroscopy and powder X-ray diffraction analysis.Interestingly,methylene (-CH-) in Bim was oxidized to carbonyl (C=O),which increases its extra-cyclic conjugation effect.For 1 and 2,their maximum emission wavelength of fluorescence around 440 and 475 nm indicates the potential as promising light-emissive materials.Meaningfully,Coion shows a quenching effect on the fluorescence of compound 1.Besides,both compounds possess remarkable structure stability.