Thermodynamics of the formation of cerium(IV) malonate complex and the kinetics of its redox decomposition O. O. Voskresenskaya, N. A. Skorik, Y. V. Yuzhakova
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ArticleSubject(s): церий | дикарбоновые кислоты | окислительно-восстановительное разложение | термодинамикаGenre/Form: статьи в журналах Online resources: Click here to access online
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Russian journal of physical chemistry A Vol. 91, № 4. P. 627-633Abstract: Thermodynamic and kinetic characteristics of cerium(IV) malonate complex formed in the first stage of cerium(IV) oxidation by malonic acid H2Mal are studied using a spectrophotometer, a photometer, and a pH-meter at a ionic strength of I = 2 in the pH region of 0.3–1.6 in a sulfuric acid medium at a temperature of 296.8 K. Its composition is found to be CeOHMal+. The form of organic ligand is Mal2−; the thermodynamic parameters of its formation and kinetic parameters of its intramolecular redox decomposition are determined. The most likely scheme of the initial stages of redox proceeding in the Ce4+–SO42-–H2Mal system is discussed, and a quantitative model of it is proposed.
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Thermodynamic and kinetic characteristics of cerium(IV) malonate complex formed in the first stage of cerium(IV) oxidation by malonic acid H2Mal are studied using a spectrophotometer, a photometer, and a pH-meter at a ionic strength of I = 2 in the pH region of 0.3–1.6 in a sulfuric acid medium at a temperature of 296.8 K. Its composition is found to be CeOHMal+. The form of organic ligand is Mal2−; the thermodynamic parameters of its formation and kinetic parameters of its intramolecular redox decomposition are determined. The most likely scheme of the initial stages of redox proceeding in the Ce4+–SO42-–H2Mal system is discussed, and a quantitative model of it is proposed.
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