THE REDUCTION OF FERRATE(VI) TO FERRATE(V) BY ASCORBATE

被引：32

作者：

CYR, JE ^{[1
]}

BIELSKI, BHJ ^{[1
]}

机构：

[1] BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973

来源：

FREE RADICAL BIOLOGY AND MEDICINE | 1991年 / 11卷 / 02期

关键词：

FERRATE(VI); FERRATE(V); FERRATE(IV); ASCORBATE; ASCORBYL FREE RADICAL; FREE RADICAL;

D O I：

10.1016/0891-5849(91)90166-Z

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The reduction of ferrate(VI) by ascorbate has been studied under anaerobic conditions in the pH range between 6.8 and 11.5 at 24-degrees-C. A mechanism is proposed that is consistent with the observed rate constants k11(HFeO4- + AH-) = (5.6 +/- 0.6) x 10(6) M-1 s-1, k12(FeO4(2-) + AH-) = (1.3 +/- 0.1) x 10(6) M-1 s-1 and the pK(HFeO4- reversible H+ + FeO4(2-) = 7.9. Stoichiometric studies show that at high ratios of [AH-]/[FeO4(2-)], one ferrate(VI) oxidizes three molecules of ascorbate to the corresponding ascorbyl (A) radicals.

引用

页码：157 / 160

页数：4

共 18 条

[1]

Bartzatt, Carr, The kinetics of oxidation of low molecular weight aldehydes by potassium ferrate, Transition Met. Chem., 11, pp. 414-416, (1986)

[2]

Audette, Quail, Smith, Oxidation of substituted benzyl alcohols with Ferrate(VI) ion, Journal of the Chemical Society, Chemical Communications, pp. 38-39, (1972)

[3]

Groves, McClusky, Alipathic hydroxylationvia oxygen rebound. Oxygen transfer catalyzed by iron, J. Am. Chem. Soc., 98, pp. 859-861, (1976)

[4]

Williams, Riley, Preparation and alcohol oxidation studies of the Ferrate(VI) ion, FeO42−, Inorganica Chimica Acta, 8, pp. 177-183, (1974)

[5]

Carr, Kelter, Tabatabai, Spichal, Erickson, McLaughlin, Properties of ferrate(VI) in aqueous solution: an alternate oxidant in wastewater treatment, Proceedings of the Conf. on Water Chlorination Chem. Environmental Impact and Health Effect, pp. 1285-1298, (1985)

[6]

Rush, Bielski, Pulse radiolysis of alkaline Fe(II) and Fe(IV) solutions. Observation of transient iron complexes with intermediate oxidation states, J. Am. Chem. Soc., 108, pp. 523-525, (1986)

[7]

Bielski, Thomas, Studies of hypervalent iron in aqueous solutions. 1. Radiation-induced reduction of Iron(VI) to Iron(V) by CO2-, J. Am. Chem. Soc., 109, pp. 7761-7764, (1987)

[8]

Rush, Bielski, Kinetics of Ferrate(V) decay in aqueous solution. A pulse-radiolysis study, Inorg. Chem., 28, pp. 3947-3951, (1989)

[9]

Halliwell, Gutteridge, Role of free radicals and catalytic metal ions in human disease: An overview, Methods in enzymology, 186, pp. 1-85, (1990)

[10]

Wagner, Nakamoto, Formation of nitrodoiron(V) porphyrins detected by resonance raman spectroscopy, J. Am. Chem. Soc., 110, pp. 4044-4045, (1988)

← 1 2 →