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pH-Metric and spectroscopic (absorption and EPR) studies were made of the proton and copper(ii) complexes of a series of ambidentate N-(phosphonomethy1)amino acids which contain both iminocarboxylate and iminophosphonate moieties. The stoichiometries and stability constants of the complexes formed were determined at 25 "C and at an ionic strength of 0.20 mol dm-3 (KCI). Stability data and spectroscopic measurements revealed that the first ligand molecule co-ordinates very strongly, forming a tridentate equimolar species, while the second one binds to the metal ion much less effectively in an axial-equatorial mode. The results were compared with those on the carboxylate analogues iminodiacetic acid and nitrilotriacetic acid.

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