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Title: Six-coordinated oxovanadium(V) complexes of reduced Schiff bases derived from amino acids: Synthesis, reactivity and redox studies
Authors: Maurya, Mannar Ram
Khurana S.
Rehder D.
Published in: Transition Metal Chemistry
Abstract: New oxovanadium(V) complexes, [VOL(hq)] (1)-(4) have been prepared by the reaction of [VO(acac)2] with ligands LH2 in the presence of 8-hydroxyquinoline (Hhq). LH2 is the dibasic tridentate ONO Mannich base [(S)H2glysal, (S)-H2alasal, (S)-H 2leusal and (S)-H2ileusal; S represents the S-enantiomer] obtained by the reduction of the Schiff bases of salicylaldehyde (sal) and the amino acids: glycine (gly), DL-alanine (ala), leucine (leu) and isoleucine (ileu), respectively. Spectral studies suggest an octahedral structure for these complexes. The complexes exhibit a single 51V-n.m.r. signal at -464.6 to -468.0 p.p.m. due to the existence of a single isomeric species in solution. In the presence of L-ascorbic acid under aerobic conditions [VO(S-glysal)(hq)] (1) and [VO(Sisoleusal)(hq)] (4) are converted into the corresponding dioxo species possible via intermediate reduction. A time-dependent 51V-n.m.r. study has also been carried out in order to investigate the possible isomerisation and/or further reaction in solution.
Citation: Transition Metal Chemistry, 28(5): 511-517
Issue Date: 2003
Keywords: Absorption spectroscopy
Amino acids
Coordination reactions
Molecular structure
Nuclear magnetic resonance spectroscopy
Organic solvents
Reaction kinetics
Redox reactions
Synthesis (chemical)
Vanadium compounds
ISSN: 3404285
Author Scopus IDs: 7005255411
Author Affiliations: Maurya, M.R., Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247 667, India
Khurana, S., Department of Chemistry, Indian Inst. of Technology Roorkee, Roorkee 247 667, India
Rehder, D., Inst. für Anorg./Angew. Chemie, Universität Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
Funding Details: Financial assistance from the Council of Scientific and Industrial Research, New Delhi is gratefully acknowledged. Bangladesh Council of Scientific and Industrial Research, BCSIR
Corresponding Author: Maurya, M.R.; Department of Chemistry, , Roorkee 247 667, India
Appears in Collections:Journal Publications [CY]

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