Oxovanadium complexes with multidentate ligands

Vanadium has ability to coordinate with multidentate ligands in different geometries to produce variety of complexes. Usually the reactions are carried out by refluxing the methanolic solution of oxovanadium salt (VOSO4) with the ligands. Vanadyl sulphate can easily exchange its sulphate group with organic ligands. Sometimes solvent molecules are also attached with the complexes. Vanadyl oxygen usually occupies the axial position. The syntheses and geometries, and selective crystal structures of these complexes are discussed.