COPPER(II) AND OXOVANADIUM(IV) COMPLEXES OF 2,3-DIHYDROXYTEREPHTHALICAND 2,3,4-TRIHYDROXYBENZOIC ACIDS

The complexes formed by 2,3-dihydroxyterephthalic and 2,3,4-trihydrbxy benzoic acids with copper(II) and oxovanadium(IV) in aqueous solution were studied by spectroscopic and potentiometric techniques. The resul ts show that all of the functional groups of the ligands are involved in complex formation. Rather stable di- and tri- or tetra-meric specie s were detected with both metal ions. While the former are ERR-silent, the latter could be characterised by EPR spectroscopy.