ABSTRACT
Seven new oxovanadium(IV) complexes, formed by the interaction of vanadyl sulfate pentahydrate and the Schiff bases, viz., N-(4′-benzoylidene-3′-methyl-1′-phenyl-2′-pyrazolin-5′-one)-p-anisidine (HL1), N-(4′-benzoylidene-3′-methyl-1′-phenyl-2′-pyrazolin-5′-one)-m-phenitidine (HL2), N-(4′-benzoylidene-3′-methyl-1′-phenyl-2′-pyrazolin-5′-one)-p-toluidine (HL3), N,N-(4′-benzoylidene-3′-methyl-1′-phenyl-2′-pyrazolin-5′-one)-o-phenylenediamine (H2L4), N,N-(4′-benzoylidene-3′-methyl-1′-phenyl-2′-pyrazolin-5′-one)-m-phenylenediamine (H2L5), N,N-(4′-benzoylidene-3′-methyl-1′-phenyl-2′-pyrazolin-5′-one)-p-phenylenediamine (H2L6) and N,N-(4′-benzoylidene-3′-methyl-1′-phenyl-2′-pyrazolin-5′-one)-benzidine (H2L7) in aqueous-ethanol, are described. The resulting complexes were characterized by elemental analyses, molar conductances, magnetic and decomposition temperature measurements, electron spin resonance, IR and electronic spectral studies. They have the compositions, [VO(L′)2(H2O)], where HL′=HL1, HL2 or HL3, [VO(L′′)(H2O)], where H2L′′=H2L4 or H2L5 and [{VO(H2O)(OH)}2(L′′′)], where H2L′′′=H2L6 or H2L7. The compounds [{VO(H2O)(OH)}2(L6)] and [{VO(H2O)(OH)}2(L7)] were found to show subnormal magnetic moments. Suitable structures have been proposed for these complexes.
ACKNOWLEDGMENTS
The authors are thankful to Shri Arun Gurtoo, Vice-chancellor of this University, for encouragement, and Professor K. K. Mishra, Head, Department of Chemistry, for laboratory facilities and helpful discussion. We are grateful to the University Grants Commission, New Delhi (Project No. F.12-57/97 (SR-I), and the Council of Scientific and Industrial Research, New Delhi (Project No. 01 (1609)/99/EMR-II), for financial assistance. Analytical facilities provided by the Central Drug Research Institute, Lucknow, India, and the Regional Sophisticated Instrumentation Centre, Indian Institute of Technology, Chennai, India, are gratefully acknowledged.