Supramolecular structure, mixed ligands and substituents effect on the spectral studies of oxovanadium(IV) complexes of bioinorganic and medicinal relevance

► Supramolecular structure is assumed to the complexes based on the spectral data. ► Nature of donor atoms was found to be greatly affected by the ESR spectral parameters. ► The mixed ligand mononuclear complex [VO(Ln)(L)(OH2)] was synthesized by reaction of VO(IV) with HLn and β-diketon (LH).