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Abstract
Four novel oxovanadium(IV) binuclear complexes have been synthesized and identified [(VO)2(BA)L2]SO4 [L denotes 2, 2′-bipyridine (bpy); 1, 10-phenanthroline (phen); 2, 9-dimethyl-l, 10-phenanthroline (Me2-phen) and 5-chloro-1, 10-phenanthroline (Cl-phen), respectively], where BA represents the dianion of bromanilic acid. The complexes were characterized by elemental analyses, molar conductivity and room temperature magnetic moment measurements, IR and electronic spectral studies. Based on these studies, extended BA-bridged structures consisting of two vanadium(IV) ions, each in a square-pyramidal environment, are proposed for these complexes. The complexes [(VO)2(BA)(bpy)2]SO4 (1) and [(VO)2(BA)(phen)2]SO4 (2) were characterized by variable temperature magnetic susceptibility measurements (4.2-300 K) and the observed data were fitted to the modified Bleaney-Bowers equation based on the Hamiltonian operator, Ĥ = -2JŜ1. Ŝ2, by the least-squares method, giving the exchange integral J. = -2.06 cm−1 for (1) and J. = -9.61 cm−1 for (2). This result indicates that there is weak antiferromagnetic spin-exchange interaction between the two VO2+ ions within each molecule.