Synthesis characterization and magnetic properties of μ‐iodanilato dinuclear oxovanadium(IV) complexes

Abstract

Abstract Five oxovanadium(IV) dinuclear complexes described by the overall formula [(VO) 2 (IA)L 2 SO 4 , where IA repents the dianion of iodanilic acid and L denotes 2, 2′‐bipyridine (bpy); 4,4′‐dimethy12,2′‐bipyridine (Meo‐bpy); 1,10‐phenanthroline (phen); 4,7‐diphenyl‐l, 10‐phenanthroline (Ph 2 ‐phen) and 5‐nitro‐1, 10‐phenanthroline (NO 2 ‐phen), have been synthesized and characterized by elemental analyses, molar conductivity and roomtemperature magnetic moment measurements, IR and electronic spectral studies. It is proposed that these complexes have IA‐bridged structures and consist of two oxovanadium(IV) ions each in a square pyramidal environment. The complexes (VO) 2 (IA) (bpy) 2 ]SO 4 , (1) and[(VO) 2 ( IA) (phen) 2 ]SO 4 (2) were further characterized by variable temperature (4.2–300 K) magnetic susceptibility measurements and the observed data were fitted to the modified Bleaney‐Bowers equation by the least‐squares method, giving the exchange integral J = ‐ 2.15 m −1 for 1 and J = ‐ 9.88 cm −1 for 2. This result indicates that there is a weak antiferromagnetic spin‐exchange interaction between the two VO 2+ ions within each molecule.