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Título : Speciation of the vanadium(III)–acetylacetone system in 3.0M KCl ionic medium at 25 C
Autor : Brito, Felipe
Araujo, Mary Lorena
Martínez, José Daniel
Hernández, Y.
Mohy, A.
Lubes, Vito
Palabras clave : Acetylacetone;
Vanadium(III) complexes
Emf(H) and UV–Vis measurements
Stability constants
LETAGROP program
Fecha de publicación : 14-Feb-2017
Resumen : A study of the Hþ-acetylacetone (acac, HC) and Hþ–V3þ-acetylacetone systems using emf(H) and UV–Vis measurements in 3.0M KCl ionic medium at 25 C is presented here. As the initial case, the acetylacetone pKa value was determined under similar experimental conditions as reported a few years ago, finding very similar values. Subsequently, in the study of the Hþ–V3þ- acetylacetone system, the stability constants of [VC]2þ, [VC2]þ, VC3, [OHVC]þ, OHVC2, [(OH)2V2C]3þ and [(OH)2V2C2]2þ complexes were determined by emf(H) measurements, and by means of UV–Vis measurements the respective values of [VC]2þ, [VC2]þ, VC3 and [OHVC]þ species, which are the most abundant in this system. The data analysis was carried out using the NERNST, FONDO, and SPEFO versions of the least-squares program LETAGROP. Some extra-thermodynamic relationships about the stability order of the VII, VIII, and VIV-acetylacetone complexes were obtained by ab initio calculations.
URI : http://hdl.handle.net/123456789/14473
ISSN : 0095-8972
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