Coordination Polymers With the Ligand (2-propyl-4,5-imidazoledicarboxylic acid): Synthesis, Structural Characteristics, and Properties Studies

Three novel metal coordination complexes with H3piadc[H3 pimdc = 2-propyl-4,5-imidazoledicarboxylic acid], [Cu(H2pim- dc)2 ] (1), [Cd(H2pimdc)2 ]n (2), and [Pb(H2pimdc)2(H2O)2]n (3) have been synthesized and structurally characterized by X-ray single-crystal analysis. Complexes 1 and 2 of X-ray crystallography reveal that each copper(II) and cadmium(II) center is four- and six-coordinated, respectively. One molecule of complex 1 is approximately perpendicular to the other molecule, and forms a squareness. Complex 2 adopts an octahedral structure. Complex 2 is connected by metal cation and forms 3-D metal-organic frameworks without solvent molecules such as H2O, CH3OH, C2H5OH, and so on. The frameworks of complex 1 have no solvent molecules such as H2O, CH3OH, C2H5OH, and so on, too. But complex 3 X-ray crystallography reveals that each lead(II) center is eight-coordinated and adopts a distorted-square structure. Complex 3 is connected by metal cation and form 3-D metal-organic frameworks with two coordinated solvent molecules(H2O).