Potentiometric equilibrium measurements are reported for the hydrolysis and polymerization of Fe(III) complexes of ethylenediaminetetraacetic acid (EDTA), cyclohexanediaminetetraacetic acid (CDTA), N-hydroxyethylethylenediaminetriacetic acid (HEDTA), and nitrilotriacetic acid (NTA), which have a 1:1 molar ratio of ligand to metal ion. Equilibrium constants are reported for the formation of monohydroxo mononuclear complexes, and for their conversion to µ-dihydroxo binuclear chelates. Heats and entropies of reaction for the formation of EDTA and CDTA mono-and binuclear dihydroxo species were calculated from temperature coefficient data. The results are interpreted on the basis of the probable structures of the metal complexes formed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.