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

Two novel coordination polymers Bim(C=O)CuI]_(2)(1)and[Bim(C=O)CdCl_(2)]_(2)(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_(1/c)and P1,respectively.The compounds were characterized by elemental analysis,infrared spectroscopy and powder X-ray diffraction analysis.Interestingly,methylene(-CH2-)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,Co^(2+)ion shows a quenching effect on the fluorescence of compound 1.Besides,both compounds possess remarkable structure stability.