title: Synthesis and spectral investigations of vanadium(IV/V) complexes derived from an ONS donor thiosemicarbazone ligand.
abstract: Four oxovanadium and one dioxovanadium complex with 2-hydroxyacetophenone N(4)-phenylthiosemicarbazone (H(2)L) which are represented as [VOLphen].2H(2)O (1), [VOLbipy] (2), [VOLdmbipy] (3), [VOL](2) (4) and [VO(2)HL].CH(3)OH (5) have been synthesized and characterized by elemental analyses, electronic, infrared and EPR spectral techniques. In all the complexes 1-4 the ligand coordinates through phenolic oxygen, azomethine nitrogen and thiolate sulfur. But in complex [VO(2)HL].CH(3)OH, coordination takes place in thione form instead of thiolate sulfur. All the complexes except [VO(2)HL].CH(3)OH are EPR active due to the presence of an unpaired electron. In frozen DMF at 77K, all the oxovanadium(IV) complexes show axial anisotropy with two sets of eight line patterns.
authors.affiliation: Department of Applied Chemistry, Cochin University of Science and Technology, Kochi 682022, Kerala, India.
authors.forename: Neema Ani
authors.initials: NA
authors.lastname: Mangalam
authors.forename: M R Prathapachandra
authors.initials: MR
authors.lastname: Kurup
mesh_terms: D000098:Acetophenones / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy; D008024:Ligands; D046911:Macromolecular Substances / Q000138:chemical synthesis / Q000737:chemistry; D008954:Models, Biological; D013055:Spectrophotometry, Infrared; D013882:Thiosemicarbazones / Q000138:chemical synthesis* / Q000737:chemistry*; D017968:Vanadium Compounds / Q000138:chemical synthesis* / Q000737:chemistry*
chemical_list: D000098:Acetophenones; D008024:Ligands; D046911:Macromolecular Substances; D013882:Thiosemicarbazones; D017968:Vanadium Compounds; C038699:acetophenone