Preparation and Investigations of Some New Metal Acetate Complexes Involving OO Donor Atoms Ligands: Di-Atomic Oxygen Bridged Dimers

Abstract

Cobalt(II), nickel(II), copper(II) and zinc(II) complexes of the type
[(M)2L1L2(-CH3COO)2(H2O)4 ](where M=Co(II), Ni(II), Cu(II), or Zn(II); L1=
benzil while, L2= deprotonated ethylene glycol) have been synthesized by 2:1:1molar
ratio for metal: benzil and ethylene glycol.Also[(M)2L1L3(-CH3COO)2(H2O)4]
complexes (where M= Co(II), Ni(II), Cu(II) or Zn(II); L1= benzil while L3=
deprotonated catechol) have been synthesized by 2: 1: 1molar reactions of metal
acetate with benzil and catechol. The resulting complexes have been characterized by
the metal content measurements, molar conductance measurements, infrared,
electronic spectra and magnetic moment measurements. The complexes are nonelectrolytes
as is evident from low values of their molar conductance. The infrared spectral studies of all the complexes indicate that the ligands behave as bidentate
chelating ligands.Also, the Infrared studies show that the water molecules are
coordinated in the complexes and the metal centres are bridged by bidentate
CH3COO groups. The different studies reveal dinuclear nature of the complexes and
the two metal atoms are hexacoordinated with octahedral geometry.