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1 1998

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Synthesis and magnetism of binuclear iron (II) complexes bridged by terephthalato dianions

Li Y.T., Yan C.W., Liao D.Z.

Polish Journal of Chemistry

1998

Vol. 72, nr 5

832-838

Four new terephthalato-bridges iron(II) binuclear complexes of the formula [Fe2(TPHA)L4](ClO4)2, where L stands for 4,4'-dimethyl-2,2'-bipyridine (Me2bpy); 2,9-dimethyl-1,10-phenanthroline (Me2phen); 5-bromo-1,10-phenanthroline (Br-phen); 5-chloro-1, 10-phenanthroline (Cl-phen), respectively, and TPHA represents the terephthalate dianion, have been synthesized and characterized. Based on the elemental analyses, molar conductance and magnetic moments of room-temperature measurements, and spectroscopic studies, extended TPHA-bridged structures consisting of two iron(II) ions, each in an octahedral environment are proposed for these complexes. The [Fe2(TPHA)(Me2bpy)4](ClO4)2 (1) and [Fe2(TPHA)(Me2phen)4](ClO4)2 (2) complexes were characterized by variable temperature magnetic susceptibility (4-300K) measurements and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator, H=-2JS-1xS-2, giving the exchange integrals J=-2.15 cm -1 for (1) and J=-3.28 cm-1 for (2). This result indicates the presence of a weak antiferromagnetic spin-exchange interaction between the metal ions within each molecule.