Chalcones as Analytical Reagents of Aluminum: Stability, Thermodynamic and Kinetic Study

Chalcones, a group of polyphenolic compounds, has been studied for a long time due to their biological properties and their ability as analytical reagents. In this work the stability and thermodynamic parameters concerning the fotmation in ethanolic medium of two chalcone-aluminium complexes (2',3-dihydroxychalcone- Al(III) and 2',4',3-trihydroxychalcone-Al(III)) were studied and a kinetic study of the formation reaction was aslo performed. Both systems showed 1 : 1 L : M stoichiometry and stability constants at four temperatures were determined. Thermodynamic parameters indicate that both formation reactions are endothermic and driving force is entropic. Kinetic study revealed that 2',4',3-trihydroxychalcone-Al(III) formation is faster than 2',3-dihydroxyclaconeAl(III), a factorwhich can be interestingwhen proposingnewanalytical reagents.