CHALCONES AS ANALYTICAL REAGENTS OF ALUMINUM: STABILITY, THERMODYNAMIC AND KINETIC STUDY

VANESA A. MUÑOZ; CAROLINA KRETEC; M. PAULINA MONTAÑA; NORA B. PAPPANO; NORA B. DEBATTISTA; GABRIELA V. FERRARI

Zeitschrift für Physikalische Chemie

OLDENBOURG VERLAG

Lugar: Munich; Año: 2015 vol. 229 p. 417 - 426

0942-9352

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.