Solution studies of complexes of iron(III) with iminodiacetic, alkyl-substituted iminodiacetic and nitrilotriacetic acids by potentiometry and cyclicvoltammetry

Potentiometric studies have been performed for the iminodiacetic (IDA), met hyliminodiacetic (MIDA)I ethyliminodiacetic (EIDA). propyliminodiacetic (PI DA), H2L, and nitrilotriacetic (NTA, H3L)-iron(III) systems at 25 degrees C and I= 0.5 mol dm (-3) in KNO3,. The model and the stability constants of the complexes formed have been determined. Deprotonation and dimerisation c onstants have been calculated and the species distribution diagrams are exp lained, together with the cyclic voltammetric studies performed for IDA- an d NTA-iron(III) systems. (C) 1999 Elsevier Science S.A. All rights reserved .