Two novel coordination polymers Bim(C=O)CuI]₂ (1) and [Bim(C=O)CdCl₂]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 P2₁/c and P, 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, Co²⁺ ion shows a quenching effect on the fluorescence of compound 1. Besides, both compounds possess remarkable structure stability.