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Volume :27 Issue : 1 2000      Add To Cart                                                                    Download

Complexes of hydroxamates IX: Binary and ternary complexes involved in the systems methioninehydroxamic acid and glycylglycine with Co(II), Zn(II) and Cd(II)

Auther : NADIA M. SHUAIB**, HAYAT MARAFIE and HAMIDU BEN YOUNGO

Department of Chemistry , Faculty of Science ,  Kuwait University ,  P 0 Box 5969 Safat 13060 Kuwait

ABSTRACT

The stability constants of the binary complexes between Co2+ Zn2+ or Cd2+ (M2+) and methioninehydroxamic acid (MX) were determined by potentiometric pH titration in aqueoussolution (I = 0.15 M, NaC1) at 25°C. The stabilities of the ternary complexes containing glycylglycine (Glygly) in addition were also calculated. The ternary enhancements were determined from K1 111k101i â011j), K22111k 201i â021j) and K22 2220 21110). Differential pulse polarographic (DPP) techniques were performed to study the reduction properties of these metal ions in the presence of the binary and ternary systems. With the aid of the potentiometric study, differential peaks were assigned to some binary and ternary species. The metal oxidation states (II) were more stable in ternary systems than in binary systems. However, Co(II) systems were not stabilized in the presence of these ligands.

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