Stopped-Flow Spectrophotometric Study of the Kinetics and Mechanism of CO2 Uptake by cis-CrC2O4BaraNH2OH22 Cation and the Acid-Catalyzed Decomposition of cis-CrC2O4BaraNH2OCO2− Anion in Aqueous SolutionReportar como inadecuado




Stopped-Flow Spectrophotometric Study of the Kinetics and Mechanism of CO2 Uptake by cis-CrC2O4BaraNH2OH22 Cation and the Acid-Catalyzed Decomposition of cis-CrC2O4BaraNH2OCO2− Anion in Aqueous Solution - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Department of General and Inorganic Chemistry, University of Gdańsk, Sobieskiego 18-19, 80-952 Gdańsk, Poland





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Abstract The kinetics of CO2 uptake by the cis-CrC2O4BaraNH2OH22+ complex cation and the acid hydrolysis of the cis-CrC2O4BaraNH2OCO2− complex anion where BaraNH2 denotes methyl 3-amino-2,3-dideoxy-b-D-arabino-hexopyranoside were studied using the stopped-flow technique. The reactions under study were investigated in aqueous solution in the 288–308 K temperature range. In the case of the reaction between CO2 and cis-CrC2O4BaraNH2OH22+ cation variable pH values 6.82–8.91 and the constant ionic strength of solution H+, Na+, ClO4− = 1.0 were used. Carbon dioxide was generated by the reaction between sodium pyruvate and hydrogen peroxide. The acid hydrolysis of cis-CrC2O4BaraNH2OCO2− was investigated for varying concentrations of H+ ions 0.01–2.7 M. The obtained results enabled the determination of the number of steps of the studied reactions. Based on the kinetic equations, rate constants were determined for each step. Finally, mechanisms for both reactions were proposed and discussed. Based on the obtained results it was concluded that the carboxylation CO2 uptake reactions of cis-CrC2O4BaraNH2OH22+ and the decarboxylation acid hydrolysis of the cis-CrC2O4BaraNH2OCO2− are the opposite of each other.

Keywords: chromiumIII complexes; 3-aminodeoxysugar ligand; kinetics and mechanism; sodium pyruvate chromiumIII complexes; 3-aminodeoxysugar ligand; kinetics and mechanism; sodium pyruvate





Autor: Dagmara Jacewicz * , Aleksandra Dąbrowska and Lech Chmurzyński

Fuente: http://mdpi.com/



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