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Kinetics and Mechanism of the Multi-step Oxidation of Ethylenediaminetetraacetate by - in Alkaline Media

DOI: 10.1039/DT9910002311

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 2311 - 2316 (1991)

Update date:2022-08-03

Topics: Hydrolysis   Ligand Exchange   pH Changes  

Authors:

Sun, YunfuSun, Yunfu

Kirschenbaum, Louis J.Kirschenbaum, Louis J.

Kouadio, IssifouKouadio, Issifou

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Article abstract of DOI:10.1039/DT9910002311

Alkaline solutions of - oxidise ethylenediaminetetraacetate (edta) in a multistep sequence which produces iminodiacetate (ida), glycinate and glycolate ions, and eventually ammonia, formaldehyde, carbon dioxide and water.The reaction shows changing stoichiometry and product distribution.At 0/->0 = 1:1, glycinate and ida are produced in similar amounts with detectable ammonia and formadehyde.When 0/->0 = 200:1, very little glycinate is produced with no ammonia or formadehyde detected.The kinetics of the oxidation was studied by the stopped-flow method at high excesses of edta and 25 deg C and I = 1.2 mol dm-3.The overall rate is as in eqauation (i) obs = ((A+B->)4->)/(-> + C4->)> (i), where the coefficients, obtained by non-linear least-square analysis, are A = 4.38 +/- 0.57 s-1, B = 34.8 +/- 1.1 dm3 mol-1 s-1 and C = 26.3 +/- 2.1.A multi-step electron-transfer mechanism is proposed involving initial C-N bond cleavage at the ethylenediamine group.

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