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1 2002

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Synthesis, Characterization and Magnetic Studies of ž-Oxamido-Bridged Cu(II)-MN(II) Heterobinuclear Complexes

Li Y., Yan C. -W., Yin X.-C.

Polish Journal of Chemistry

2002

Vol. 76 / nr 1

13-21

Four new ž-oxamido-bridged copper(II)-manganese(II) heterobinuclear complexes described by the overall formula [Cu(dmoxpn)MnL2](ClO4)2, where dmoxpn denotes N,N_-bis[3-(dimethylamino)propyl)]oxamido dianion, L represents 2,2_-bipyridine (bpy); 4,4_-dimethyl-2,2_-bipyridine (Me2-bpy); 5-chloro-1,10-phenanthroline (Cl-phen) or 5-bromo-1,10-phenanthroline (Br-phen), have been synthesized and characterized. Based on elemental analyses, IR and electronic spectra studies and molar conductivity measurements, these complexes are proposed to have oxamido-bridged structures and to consist of the copper(II) ion in a planar environment and the manganese(II) ion in an octahedral environment. The electronic reflectance spectrum indicates the presence of exchange- coupling interaction between bridging copper(II) and manganese(II) ions. The [Cu(dmoxpn)Mn(bpy)2](ClO4)2 complex has been further characterized by variable temperature susceptibility (4.2-300 K) and the observed data were least-square fitted to the susceptibility equation derived from the spin Hamiltonian, _H = -2J _ S1_ S2, giving the exchange integral J = -27.8 cm-1. The results are commensurate with antiferromagnetic interaction between the adjacent manganese(II) and copper(II) ions through the oxamido-bridge within the complex. The influence of structural variation of the bridging ligand on magnetic interactions between the metal ions of this kind of complexes is also discussed.