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Further relaxation kinetic investigations of iron(III) chelation. Data for diglycolic, tartaric, and citric acids
Author(s) -
Cavasino F. Paolo,
Di Dio Emanuele,
Sbriziolo Carmelo
Publication year - 1984
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550160305
Subject(s) - chemistry , tartaric acid , citric acid , chelation , inorganic chemistry , kinetics , aqueous solution , limiting , ligand (biochemistry) , catechol , ionic bonding , ion , organic chemistry , biochemistry , mechanical engineering , physics , receptor , quantum mechanics , engineering
Abstract The kinetics of the reactions of iron(III) with diglycolic, tartaric, and citric acids have been studied in aqueous acid solutions by the temperature‐jump method at 25.0°C and at ionic strengths 1.0 (for tartaric and citric acids) and 0.50 mol/dm 3 (for diglycolic acid). The experimental data indicate that iron(III) monochelate formation occurs by the same reaction mechanism for all three ligands examined and that only pathways involving the FeOH 2+ ion contribute to the chelation process. The reacting species for citric acid is the undissociated ligand. For tartaric and diglycolic acids both the neutral ligands and the corresponding monoanions react significantly under the experimental conditions used. Kinetic evidence for the contribution of intermediate steps to the limiting rate in the overall chelate‐formation process has been obtained and discussed.