Synthesis and structures of a series of d10 coordination compounds based on flexible bis(imidazole) ligand and dicarboxylates

A series of new coordination compounds based on 1,6-bis(2-methyl-imidazole-yl)-hexane (bimh), namely [Zn(bimh)(0.5)(chda)](n) (1), {[Cd(bimh)(0.5)(bda)]center dot H2O} n (2), [Cd(bimh)(oba)] n (3), [Zn(bimh)(oba)] n (4), [Cd(bimh) (ipa)](n) (5), {[Zn(bimh)(0.5)(ipa)]center dot H2O} n (6), (bimh D 1,6-bis(2-methyl-imidazole-1-yl) hexane, H(2)chda D 1,4cyclohexanedicarboxylic acid, H(2)bda = 2,2 '-biphenyldicarboxylic acid, H(2)oba D 4,4 ' xybis(benzoic acid), and H(2)ipa D isophthalic acid) have been synthesized by solvothermal route and diffusion method and characterized by elemental analysis, IR spectroscopy, single-crystal X-ray diffraction technology. Compound 1 affords a two-dimensional (2D) wave-like framework with dinuclear paddle-wheel units, where the structures are further assembled via aromatic pi-pi stacking to generate a 3D network. Compound 2 exhibits a 1D ladder chain, which is further linked by hydrogen bonds to form a 2D architecture. Compounds 3 and 4 are isostructural, possessing a 2D layer network based on hydrogen bonds. Compound 5 displays a 2D wave-like layer structure. Compound 6 has a 1D line chain structure, which is packed into a 3D supermolecule network by two types of hydrogen bonds. Furthermore, the thermal stabilities and photoluminescent properties for compounds 1-6 were investigated.