Synthesis, structures, and properties of copper(II), manganese(II), cobalt(II) and nickel(II) coordination polymers based on 3,3'-bipyridine-5-carboxylic acid

摘要

Assembly of 3,3'-bipyridine-5-carboxylic acid (3-Hbpc) with different transition metal salts produces four coordination polymers, [Cu(3-bpc)(2)] (n) (1), [M(3-bpc)(2)(H2O)(2)] (n) (M = Mn, 2; Co, 3; Ni, 4). All the complexes have been hydrothermally synthesized and characterized via physicochemical and spectroscopic methods. Single-crystal X-ray diffraction indicates that compound [Cu(3-bpc)(2)] (n) (1) shows the 1D coordination motif, and compounds [M(3-bpc)(2)(H2O)(2)] (n) (M = Mn, 2; Co, 3; Ni, 4) are isostructural, with similar 2D layered coordination structures. In addition, hydrogen-bonding interactions are observed in compounds 2-4 to further extend the coordination motifs. These complexes with different 1D and 2D coordination motifs indicate the metal-directed assembly. In addition, the thermal stability of all the complexes has also been studied and discussed.