POTENTIOMETRIC STUDIES OF BINARY AND TERNARY COMPLEXES INVOLVING CADMIUM(II) AND NITRILO-TRIS(METHYL PHOSPHONIC ACID) WITH AMINO ACIDS, PEPTIDES AND DNA CONSTITUENTS.

This article presents the results of potentiometric studies of the formation of binary and ternary complexes involving cadmium in the form of Cd(II), nitrilo-tris(methylphosphonic acid) (NTP) and some selected bio-relevant ligands. Stoichiometry and stability constants for the complexes formed are reported. The ternary complexes are formed in a stepwise mechanism whereby NTP binds to cadmium(II), followed by coordination of amino acids, peptides or DNA. The concentration distribution of the various complex species has been evaluated.