COMPLEXES OF HYDROXAMATES .8. THE AFFINITY OF METHIONINEHYDROXAMIC ACID FOR MIXED METAL COMPLEXATION POTENTIOMETRIC AND POLAROGRAPHIC STUDIES

Binary metal complexations of Ni(II), Cu(II), and Zn(II) with methionine-hydroxamic acid (MX) were studied potentiometrically at 37-degrees-C and mu = 0.15 M NaCl. The mixed metal complexes with MX, (MX-Cu(II)-Ni(II), MX-Cu(II)-Zn(II), and MX-Ni(II)-Zn(II)) were also studied under the same conditions. The ternary enhancement was discussed in terms of the binary complex formation. In addition, the binary and ternary systems were studied by differential pulse polarography and the behavior of the reduction properties of the different ternary species were correlated with those of the simple metal ions and the binary species.