Multinuclear Metal Complexes of Schiff Base

Abstract

Multinuclear metal complexes of the type [M₂(3-FSA-PDA)₂·nH₂O] and [M₄(3-FSA-PDA)₂·nH₂O]where 3 FSA-PDA is a schiff base, derived from 3-formylsalicyclic acid and p-phenylene diamine; M = copper(II), nickel(II) and cobalt(II), n = 2 or 4 have been isolated. These have been characterized on the basis of elemental analysis, spectral studies, magnetic and conductivity measurements and thermal analyses. In case of binuclear complexes the metal ions are attached to the inner coordination sphere having N₂O₂-chromosphore. They have planar/tetrahedral geometry around them with a slightly lower magnetic moment values at room temperature, while in case of tetra nuclear complexes the inner coordination sphere and outer having N₂O₂ and O₄⁻ chromophores, respectively. They show strong anti ferromagnetic interaction due to the presence of an oxo-bridge. Both bi and tetranuclear complexes are non-electrolytes in dioxane as evidenced from their low molar conductance values. IR and thermal analyses data of the tetranuclear complexes suggest the presence of coordinated water molecules.