Structural and spectral study of coordination of 4,4′-dimethoxy-2,2′-bipyridine toward Zn(II) and Cd(II) containing thiocyanato or azido ligands

Three new compounds of zinc(II) and cadmium(II) with the ligand 4,4'-dimethoxy-2,2'-bipyridine (4,4'-dmo-2,2'-bpy), including cis-[Zn(4,4'-dmo-2,2'-bpy)(2)(SCN)(2)] (1), cis-[Cd(4,4'-dmo-2,2'-bpy)(2)(SCN)(2)] (2), and [Cd-3(4,4'-dmo-2,2'-bpy)(3)(N-3)(5)(OAc)](n) (3), have been obtained as white single crystals by the branched tube method and characterized by elemental analysis, FT-IR and H-1, C-13 NMR spectroscopy, and X-ray crystallography. Single-crystal structure analyses of the isostructural complexes 1 and 2 showed distorted octahedral geometry for zinc(II) and cadmium(II) with ZnN6 and CdN6 environments. Complex 3 reveals a rare coordination polymer containing octahedrally coordinated cadmium(II) expanding to chains by two different bridging modes, including Cd-O-C-O-Cd and Cd-N-Cd.