SYNTHESIS AND MAGNETIC-PROPERTIES OF COPPER(II)-M(II)-COPPER(II) TRINUCLEAR COMPLEXES WITH N,N'-BIS(2-AMINOETHYL)OXAMIDOCOPPER(II) [M=CO AND NI]

Two novel trinuclear complexes were prepared, namely [Cu-2(oxae)(2)(H2O)(2)M] (ClO4)(2), [oxae = N,N'-bis(2-aminoethyl)oxamido dianion; M = Co and Ni]. Based on elemental analyses, conductivity measurements and i.r. spectra, the complexes are proposed to have extended oxamido-bridged structures. The magnetic susceptibility of [Cu-2(oxae)(2)(H2O)(2)Co](ClO4)(2) were measured over the 4-300 K range and the observed data were successfully simulated by an equation based on the spin Hamiltonian, ($) over cap H = - 2 J(($) over cap S-1.($) over cap S-2 + ($) over cap S-2.($) over cap S-3). The exchange integral, J, was found to be equal to -29.2 cm(-1), indicating an antiferromagnetic spin-exchange interaction between the adjacent metal ions.