Potentiometric studies of binary and ternary complexes involving cadmium(II) and nitrilo-tris(methyl phosphonic acid) with amino acids, peptides and DNA constituents.
The complexing properties of nitrilo-tris(methylphosphonic acid) (NTP) with cadmium(II) were investigated pH-metrically at 25 degrees C and at ionic strength of 0.1 mol dm(-3) (NaNO3). Stoichiometry and stability constants for the complexes formed are reported. Cadmium (II) forms Cd(NTP)(4-) and the corresponding hydroxy complexes. 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.
Shoukry
Azza A
AA
Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt.
Shoukry
Mohamed M
MM
D000596:Amino Acids / Q000737:chemistry*; D002104:Cadmium / Q000737:chemistry*; D002614:Chelating Agents / Q000737:chemistry*; D004247:DNA / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D009943:Organophosphorus Compounds / Q000737:chemistry*; D010455:Peptides / Q000737:chemistry*; D011199:Potentiometry / Q000379:methods*
D000596:Amino Acids; D002614:Chelating Agents; D009943:Organophosphorus Compounds; D010455:Peptides; D002104:Cadmium; C041182:(nitrilotris(methylene))triphosphonic acid; D004247:DNA