Relaxation kinetic study of iron(III) chelation with glycolic and lactic acids. Contribution of intermediate steps to the limiting rate in the overall process

F.P. Cavasino, E. Di Dio, C. Sbriziolo
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引用次数: 2

Abstract

The kinetics of formation of iron(III) monochelates with glycolic and lactic acids have been investigated by the temperature-jump method at 25.0°C and ionic strength 1.0 M over the acidity range 0.0200 – 0.900 M. The kinetic data indicate that two reaction paths, involving the FeOH2+ ion and the neutral and anionic (HL-L) forms of the ligands, lead to the iron(III) chelate formation and that the monodentate complex Fe(OH)L-LH+ is formed as an intermediate compound. Moreover the observed [H+]-dependence of the forward rate constants permits us to estimate the contribution of intermediate steps to the limiting rate in the overall chelate formation process.

铁(III)与乙醇酸和乳酸螯合的弛豫动力学研究。中间步骤对整个过程中极限速率的贡献
采用跳温法研究了铁(III)与乙醇酸和乳酸在25.0℃、离子强度1.0 M、酸度0.0200 ~ 0.900 M条件下形成单螯合物的动力学。动力学数据表明,铁(III)的形成有两种反应途径,分别为FeOH2+离子和配体的中性和阴离子(HL-L -)形式,并形成单齿配合物Fe(OH)L-LH+作为中间化合物。此外,观察到的正向速率常数对[H+]的依赖性使我们能够估计在整个螯合物形成过程中中间步骤对极限速率的贡献。
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