The kinetics of the complex formation between iron(III)–ethylenediaminetetraacetate and hydrogen peroxide in aqueous solution
作者:Virender K. Sharma、Frank J. Millero、Zoltan Homonnay
DOI:10.1016/j.ica.2004.04.016
日期:2004.9
Abstract The kinetics of the formation of the purple complex [Fe III (EDTA)O 2 ] 3− , between Fe III –EDTA and hydrogenperoxide was studied as a function of pH (8.22–11.44) and temperature (10–40 °C) 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
摘要研究了Fe III –EDTA与过氧化氢之间紫色配合物[Fe III(EDTA)O 2] 3−形成动力学随pH(8.22–11.44)和温度(10–40°C)的变化。 )在水溶液中使用停流方法。对于两种反应物,反应均为一级反应。观察到的二阶速率常数随pH值的增加而降低,并且似乎与Fe III -EDTA([Fe(EDTA)H 2 O]-⇔Fe(EDTA)OH] 2 + H +)的去质子化有关。发现形成络合物的速率定律为d [Fe III EDTAO 2] 3- / dt = [(k 4 [H +] /([[H +] + K 1)]] [Fe III -EDTA] [H 2 O 2],其中k 4 = 8.15±0.05×10 4 M -1 s -1和p K 1 = 7.3。简要讨论了形成[Fe(EDTA)O 2] 3-的步骤。
General Approach to Direct Measurement of the Hydration State of Coordination Complexes in the Gas Phase: Variable Temperature Mass Spectrometry
作者:Emily E. Racow、John J. Kreinbihl、Alexia G. Cosby、Yi Yang、Apurva Pandey、Eszter Boros、Christopher J. Johnson
DOI:10.1021/jacs.9b05874
日期:2019.9.18
general and high-throughput method for characterizing the hydration state of para- and diamagnetic coordination complexes in the gas phase based on variable-temperature ion trap tandem mass spectrometry. Ternary aqua complexes are directly observed in the mass spectrum and quantified as a function of ion trap temperature. We recover expected periodic trends for hydration across the lanthanides and distinguish
Influence of Fluoride on the Reversible Binding of NO by [Fe<sup>II</sup>(EDTA)(H<sub>2</sub>O)]<sup>2−</sup>. Inhibition of Autoxidation of [Fe<sup>II</sup>(EDTA)(H<sub>2</sub>O)]<sup>2−</sup>
作者:Joachim Maigut、Roland Meier、Rudi van Eldik
DOI:10.1021/ic800378c
日期:2008.7.1
The promising BioDeNO(x) process for NO removal from gaseous effluents suffers from an unsolved problem that results from the oxygen sensitivity of the Fe-II-aminopolycarboxylate complexes used in the absorber unit to bind NO(g). The utilized [Fe-II(EDTA)(H2O)](2-) complex is extremely oxygen sensitive and easily oxidized to give a totally inactive [Fe-III(EDTA)(H2O)](-) species toward the binding of NO(g). We found that an in situ formed, less-oxygen-sensitive mixed-ligand complex, [Fe-II(EDTA)(F)](3-), still reacts quantitatively with NO(g). The formation constant for the mixed ligand complex was determined spectrophotometrically. For [Fe-III(EDTA)(F)](2-) we found log K-MLF(F) = 1.7 +/- 0.1. The [Fe-II(EDTA)(F)](3-) complex has a smaller value of log K-MLF(F) = 1.3 +/- 0.2. The presence of fluoride does not affect the reversible binding of NO(g). Even over extended periods of time and fluoride concentrations of up to 1.0 M, the nitrosyl complex does not undergo any significant decomposition. The [Fe-III(EDTA)(NO-)](2-) complex releases bound NO on passing nitrogen through the solution to form [Fe-II(EDTA)(H2O)](2-) almost completely. A reaction cycle is feasible in which fluoride inhibits the autoxidation of [Fe-II(EDTA)(H2O)](2-) during the reversible binding of NO(g).
The mechanism of iron EDTA catalyzed superoxide dismutation
作者:Christopher Bull、Gregory J. McClune、James A. Fee
DOI:10.1021/ja00354a019
日期:1983.8
Mechanistic Studies on the Reaction of [Fe
<sup>III</sup>
(edta)(H
<sub>2</sub>
O)]
<sup>–</sup>
with Piloty′s Acid as Source for HNO
作者:André Muthig、Justyna Polaczek、Rudi Eldik
DOI:10.1002/ejic.201900261
日期:2019.6.16
[FeIII(edta)(H2O)]– as starting material to see whether the reaction of this complex would lead directly to the formation of the nitroxyl complex by using a source for HNO. In the present study, Piloty's acid (benzenesulfonylhydroxamic acid) was used as source for HNO, since it cleanly hydrolysis in basic aqueous solution to release HNO. The results of our studies clearly indicate that the same reaction product
在我们实验室进行的较早工作中,研究了[Fe II(edta)(H 2 O)] 2–与· NO(g)的反应作为捕集· NO(g)的反应,发现该反应非常有效。约形成常数。25°C时10 6 M –1。所形成的亚硝酰基配合物显示出具有实质上的Fe III -NO - ,即硝酰基,字符与详细的计算研究一致之前进行。近年来,我们对HNO / NO –(硝基)的化学产生了兴趣,并决定使用[Fe III(edta)(H 2 O)] –作为起始材料,以了解这种配合物的反应是否会通过使用HNO的来源直接导致硝酰配合物的形成。在本研究中,Piloty酸(苯磺酰基异羟肟酸)被用作HNO的来源,因为它在碱性水溶液中可以干净地水解以释放HNO。我们的研究的结果清楚地表明,如发现的反应的[Fe相同的反应产物II(EDTA)(H 2 O)] 2-与· NO,形成在[Fe的反应(G)III(EDTA )(H 2 O)]