POLAROGRAPHIC STUDY OF COMPLEXES OF LEAD(II), COPPER(II), CADMIUM(II)AND ZINC(II) WITH CYCLOHEXYLTHIOGLYCOLATE AND HEXYLTHIOGLYCOLATE

The complexation of Pb(II), Cu(II), Cd(II) and Zn(II) by cyclohexylthi oglycolate and hexylthioglycolate has been studied polarographically. The reduction of Pb(II) has been found to be reversible and diffusion- controlled involving a two-electron transfer process, while the reduct ion of Cu(II), Cd(II) and Zn(II) has been found to be irreversible and diffusion-controlled in both the cases. The stability constants of Pb (II) has been calculated by DeFord and Hume's method, while Crow's mea n diffusion coefficient method has been used in case of the other meta l complexes which are reduced irreversibly.