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1 Polish Journal of Chemistry

1 1999

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Synthesis and antiferromagnetic interaction in tetrabromoterephthalato-bridged binuclear iron(II) complexes

Li Y., Yan C.

Polish Journal of Chemistry

1999

vol. 73 nr 3

417-424

Five new binuclear iron(II) complexes have been synthesized and characterized , namely: [Fe2(BTPHA)L4]ClO4)2, where L stands for 4,4'-dimethyl-2,2'-bipyridyne (Me2-bpy); 2,9-dimethyl-1,10-phenanthroline (Me2-phen); 5-bromo-1,10-phenanthroline (Br-phen); 5-chloro-1,10-phenanthroline (Cl-phen) and 5-methyl-1,10-phenanthroline (ME-phen), respectively, and BTPHA represents the tetrabromoterephthalate dianion. Based on the elemental analyses, molar conductance measurements, and spectroscopic studies, extended BTPHA-bridged structures consisting of two iron (II) ions, each in an octahedral environment are proposed for these complexes. The variable temperature magnetic susceptibilities (4-300 K) for [Fe2(BTPHA)(Me2-bpy)4](ClO4)2 (1) and [Fe2(BTPHA)(Me2-phen)4](ClO4)2 (2) complexes were measured and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator, H=-2J S1×S2, giving the exchanche integrals J= -1.09 cm -1 for (1) and J= -2.13 cm-1 for (2). These results indicate the presence of a weak antiferromagnetic spin-exchange interaction between the metal ions within each molecule. The influence of the bromo substituents in the bridge ligand on the magnetic interactions between the metal ions in this kind of complexes is also discussed.