INQUISAL   20936
INSTITUTO DE QUIMICA DE SAN LUIS "DR. ROBERTO ANTONIO OLSINA"
Unidad Ejecutora - UE
artículos
Título:
CHALCONES AS ANALYTICAL REAGENTS OF ALUMINUM: STABILITY, THERMODYNAMIC AND KINETIC STUDY
Autor/es:
VANESA A. MUÑOZ; CAROLINA KRETEC; M. PAULINA MONTAÑA; NORA B. PAPPANO; NORA B. DEBATTISTA; GABRIELA V. FERRARI
Revista:
Zeitschrift für Physikalische Chemie
Editorial:
OLDENBOURG VERLAG
Referencias:
Lugar: Munich; Año: 2015 vol. 229 p. 417 - 426
ISSN:
0942-9352
Resumen:
Chalcones are a group of polyphenolic compounds studied for a long time due to theirbiological properties and their ability as analytical reagents. In this work the stabilityand thermodynamic parameters of the formation of 2´,3-dihydroxychalcone-Al(III) and2´,4´,3-trihydroxychalcone-Al(III) complexes in ethanolic medium were studied and akinetic study of the formation reaction was performed. Stoichiometry determined forboth systems was 1:1 L:M and stability constants at four temperatures weredetermined. Thermodynamic parameters indicate that both formation reactions areendothermic and driving force is entropic. Kinetic study showed that 2´,3-dihydroxyclacone-Al(III) formation is faster than 2´,4´,3-trihydroxychalcone-Al(III), afactor which can be interesting when proposing new analytical reagents.