Syntheses,structures and properties of a new compound of the type [Zn(4,4′-dmo-2,2′-bpy) 2 (CH 3 COO)] 2 [Zn(SCN) 4 ]·H 2 O with zinc in two cationic and one anionic complexes

Abstract

Abstract

A new compound of zinc(II) with the ligand 4,4′-dimethoxy-2,2′-bipyridine(4,4′-dmo-2,2′-bpy), [Zn(4,4′-dmo-2,2′-bpy)₂(CH₃COO)]₂[Zn(SCN)₄]·H₂O, has been obtained as white single crystals by the branched tube method and characterized by elemental analysis, IR and ¹H NMR spectroscopy and by X-ray crystallography. Thermal and electrochemical properties were also studied. The crystal structure consits of two discrete [Zn(4,4′-dmo-2,2′-bpy)₂(CH₃COO)] ⁺ cations and a [Zn(SCN)₄]^2 − anion. Zinc(II) cations in the [Zn(4,4′-dmo-2,2′-bpy)₂(CH₃COO)] ⁺ units have a distorted octahedral surrounding by ZnN₄O₂ coordinated through four N atoms of 4,4′-dmo-2,2′-bpy and two O atoms of acetate. Zinc(II) in [Zn(SCN)₄]^2 − has a distorted tetrahedral coordination environment with an ZnN₄ ligated by four N atoms of the terminal thiocyanates. In the solid state, [Zn(4,4′-dmo-2,2′-bpy)(CH₃COO)] ⁺ cations are interconnected by tetrahedral [Zn(NCS)₄]^{2  −} units by cooperative C–H···O, C–H···S, C–H···N and π-π stacking interactions resulting in a 2D network structure. Establishment of such networks seems to be aiding the crystallization.