Kinetics and mechanism of complexation reactions of (i)Ni(ii),Cu(II)-Glutathione(ii)Ni(II)Co(II),Cu(II)-2-Aminobenzoic acid (iii)Ni(II),Co(II),Cu(II)-L-proline L-isoleucine(v)Ni(II),Co(II),Cu(II)-ethanbutol
