Synthesis and characterization of two new zinc(II) coordination polymers with bidentate flexible ligands: Formation of a 2D structure with (4 4 .6 2 )-sql topology

Zinc(II) coordination polymers [Zn(bip) 2 (NCS) 2 ] n ( 1 ) and [Zn(μ-bbd)(N 3 ) 2 ] n ( 2 ) were synthesized by using the neutral flexible bidentate N-donor ligands 1,4-bis(3,5-dimethylpyrazolyl)butane ( bbd ) and 1,3-bis(imidazolyl)propane ( bip ), mono-anionic NCS − or N 3 − ligand and zinc(II) chloride salts. The results of the X-ray analyses demonstrate that in the structure of 1, the zinc(II) ion is located on an inversion center and exhibits an ZnN 6 octahedral arrangement while, in the structure of 2, the zinc(II) ion adopts an ZnN 4 tetrahedral geometry. In the polymer 1, the NCS groups are terminally N-bonded to the metal center and the each bip with anti-gauche conformation acts as bridging connecting four zinc(II) ions to form a two-dimensional network with a sql [point symbol (4 4.6 2 )] topology while, in the polymer 1, the N 3 groups are terminally bonded to the metal center and each bbd with anti-anti-anti conformation acts as bridging ligand connecting two zinc(II) ions to form a one-dimensional zig-zag chain. Coordination compounds 1 and 2 have been characterized by infrared spectroscopy, elemental analyses and single-crystal X-ray diffraction. Thermal analyses of polymers were also presented.