Abstract

OLIVEROS-BASTIDAS, Alberto de J; CARRERA, Ceferino A  and  MARIN, David. UV-VIS SPECTROPHOTOMETRY STUDY OF THE REACTION BETWEEN CIANIDE IONS AND PICRATE. A PRACTICAL EXAMPLE OF ANALYTICAL APPLICATIONS AND KINETIC STUDIES. Rev.Colomb.Quim. [online]. 2009, vol.38, n.1, pp.61-82. ISSN 0120-2804.

The kinetics of the cianide-picrate reaction was studied on the basis of UV-Vis spectrophotometry. A first order reaction was found for each reagent. It was also observed a batocromic displacement of the maximum absorbance wavelength, by increasing the concentration of any of the reagents, this result is associated to the formation of different stoichiometry complexes and the subsequent spectrometric parameters change. These results support the existence of an interaction of the π kind for the resulting complex, and a parallel result was obtained by using other π electron donor molecules. This displays the evidence of plausible interferences of some chemicals in qualitative and quantitative analytical applications of this reaction, specially of those used in the cianogenic frequence and quantitaive cianogenic glycosides determination in plants.

Keywords : UV-Vis; sodium picrate; kinetics; complex; analytical implications.

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