Circular dichroism studies of formation of complexes of oxovanadium(IV), cobalt(II) and nickel(II) with (+)-6-aminopenicillanic acid in aqueous solution

The complex forming ability of (+)-6-aminopenicillanic acid with oxovanadiu m(IV), cobalt(II) and nickel(II) in aqueous solution maintained at 35 degre esC is studied through circular dichroism spectra In these systems, complex ation is indicated with the development of well defined CD bands in crystal field region between 18,349-24, 691 cm(-1). The optimum conditions of pH, stoichiometry, time for attaining maximum complexation and formation consta nts are reported for these complex ions. The CD bands are assigned to elect ronic transitions.