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1 Polish Journal of Chemistry

1 1998

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Synthesis , characterization and magnetic studies of my-oxamido heterodinuclear copper(II)-iron(II) complexes

Li Y.T., Yan C.W., Kong X.H.

Polish Journal of Chemistry

1998

Vol. 72, nr 9

2052-2059

Six new my-oxamido heterodinuclear complexes, [Cu(Me2oxpn)Fe(L)2]SO4, have been synthesized from the planar monomeric fragment [Cu(Me2oxpn)], where Me2oxpn denotes N,N'-bis(3-amino-2,2-dimethylpropyl)oxamido dianion and L represents 1,10-phenanthroline(phen);5-nitro-1,10-phenanthroline (NO2-phen); 5-chloro-1,10-phenanthroline (Cl-phen); 5-bromo-1,10-phenanthroline (Br-phen); 5-methyl-1,10-phenanthroline (Me-phen) and 2,2'-bipyridine (bpy). Based on the elemental analyses, spectroscopic studies, magnetic moments (at room temperature) and molar conductivity measurements, extended oxamido-bridges structures consisting of a copper(II) and an iron(II) ions, which have a square planar environmental and an octahedral environment, respectively, are proposed for these complexes. The [Cu(Me2oxpn)Fe(bpy)2]SO4 (1) and [Cu(Me2oxpn)Fe(phen)2]SO4 (2) complexes have been characterized by variable temperature magnetic susceptibility (4.2-300 K) and the oberved data were least-squares fitted to the susceptibility equation derived from the spin Hamiltonian including single- ion zero-field interaction for the iron(II) ion, H=-2JS1 x S2 - DS(2)-Zl, giving the exchange integrals J=-15.8 cm(-1) for (1) and J=-17.6 cm(-1) for (2). These results indicated that the spin coupling between the adsjacent copper(II) and iron(II) ions through oxamido-bridge in both complexex (1) and (2) is antiferromagnetic.