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首页> 外文期刊>Inorganica Chimica Acta >The kinetics of the complex formation between iron(III)-ethylenediaminetetraacetate and hydrogen peroxide in aqueous solution
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The kinetics of the complex formation between iron(III)-ethylenediaminetetraacetate and hydrogen peroxide in aqueous solution

机译:铁(III)-乙二胺四乙酸铁与过氧化氢在水溶液中形成配合物的动力学

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摘要

The kinetics of the formation of the purple complex [Fe-III(EDTA)O-2](3-), between Fe-III-EDTA and hydrogen peroxide was studied as a function of pH (8.22-11.44) and temperature (10-40 degreesC) in aqueous solutions using a stopped-flow method. The reaction was first-order with respect to both reactants. The observed second-order rate constants decrease with an increase in pH and appear to be related to deprotonation of Fe-III-EDTA [Fe(EDTA)H2O](-) double left right arrow Fe(EDTA)OH](2-) + H+. The rate law for the formation of the complex was found to be d[Fe(III)EDTAO(2)](3-)/dt=[(k(4)[H+]/([H+] + K-1)][Fe-III-EDTA][H2O2], where k(4) = 8.15 +/- 0.05 x 10(4) M-1 s(-1) and pK(1) = 7.3. The steps involved in the formation of [Fe(EDTA)O-2](3-) are briefly discussed. (C) 2004 Elsevier B.V. All rights reserved.
机译:研究了在Fe-III-EDTA与过氧化氢之间形成紫色络合物[Fe-III(EDTA)O-2](3-)的动力学与pH(8.22-11.44)和温度(10)的关系。使用停止流方法在水溶液中加入-40摄氏度)。对于两种反应物,反应均为一级反应。观察到的二级速率常数随pH值的增加而降低,并且似乎与Fe-III-EDTA [Fe(EDTA)H2O](-)的去质子化有关。向左向右箭头Fe(EDTA)OH](2-) + H +。发现形成复合物的速率定律是d [Fe(III)EDTAO(2)](3-)/ dt = [(k(4)[H +] /([H +] + K-1) ] [Fe-III-EDTA] [H2O2],其中k(4)= 8.15 +/- 0.05 x 10(4)M-1 s(-1)和pK(1)= 7.3。 [Fe(EDTA)O-2](3-)的简要描述(C)2004 Elsevier BV保留所有权利。

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