IQUIR 05412
INSTITUTO DE QUIMICA ROSARIO
Unidad Ejecutora - UE
artículos
Título:
Quinic acid and hypervalent chromium: a spectroscopic and kinetic study
Autor/es:
MARÍA FLORENCIA MANGIAMELI; LUIS SALA; SEBASTÍAN BELLÚ; NADIA MAMANA; BÁRBARA PEREZ MORA
Revista:
RSC Advances
Editorial:
Royal Society of Chemistry
Referencias:
Año: 2018 vol. 8 p. 29356 - 29367
ISSN:
2046-2069
Resumen:
The redox reaction between an excess of quinic acid (QA) and CrVI involves the formation of intermediates,namely, CrIV and CrV species, which in turn react with the organic substrates. As observed with othersubstrates that have already been studied, CrIV does not accumulate during this reaction because of therate of the reaction. Its rate of disappearance is several times higher than that of the reaction of CrVI orCrV with QA. Kinetic studies indicate that the redox reaction proceeds via a combined mechanism thatinvolves the pathways CrVI /CrIV /CrII and CrVI /CrIV /CrIII, which is supported by the observationof superoxo-CrIII (CrO22+) ions, free radicals, and oxo-CrV species as intermediates and the detection ofCrVI ester species. The present study reports the complete rate laws for the QA/chromium redox reaction.
