Syntheses, Structures, and Photoluminescent Properties of Coordination Polymers Based on 1,4-Bis(imidazol-l-yl-methyl)benzene and Various Aromatic Dicarboxylic Acids

Nine coordination polymers, formulated as {[Zn(p-bdc)(bix)](DMF)2}n (1), {[Co(p-bdc)(bix)](DMF)2}n (2), {[Cd(p-bdc)(bix)](DMF)2}n (3), {[Zn(bpdc)(bix)](DMF)3}n (4), {[Co(bpdc)(bix)](DMF)3}n (5), {[Cd(m-bdc)(bix)(H2O)](DMF)}n (6), {[Zn(m-bdc)(bix)](solv)x}n (7), {[Zn2(m-bdc)2(bix)2](solv)x}n (8), and {[Zn(m-bdc)(bix)](solv)x}n (9) (p-H2bdc = 1,4-benzenedicarboxylic acid, H2bpdc = biphenyl-4,4′-dicarboxylic acid, m-H2bdc = 1,3-benzenedicarboxylic acid), have been prepared by solvothermal reactions of the semirigid neutral ligand 1,4-bis(imidazol-l-yl-methyl)benzene (bix) with metal ions in the presence of various aromatic dicarboxylic acids. These complexes were characterized by Fourier transform infrared (FT-IR) spectroscopy, elemental analysis, thermogravimetric analysis (TGA), and single-crystal X-ray diffraction analysis. Isostructural complexes 1 and 2 reveal a 3-fold interpenetrating three-dimensional (3D) framework with dia topological type. Compound 3 exhibits a non-interpenetrating, highly undulati...