Study of the Ternary Complex Formation Between Vanadium(III)-Picolinic Acid and the Amino Acids: Cysteine,Histidine, Aspartic and Glutamic Acids |
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| Authors: | Héctor Rosas Leydi Erika Sarmiento Mildred Rodríguez Vito Lubes |
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| Institution: | 1.Departamento de Química,Universidad Simón Bolívar (USB),Caracas,Venezuela |
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| Abstract: | The complex species formed between vanadium(III)-picolinic acid (HPic) and the amino acids: cysteine (H2Cys), histidine (HHis), aspartic acid (H2Asp) and glutamic acid (H2Glu) were studied in aqueous solution by means of electromotive forces measurements emf(H) at 25 °C and 3.0 mol⋅dm−3 KCl as ionic medium. Data analysis using the least-squares program LETAGROP indicates the formation of ternary complexes,
whose stoichiometric coefficients and stability constant were determined. In the vanadium(III)-picolinic acid-cysteine system
the model obtained was: V(Pic)(H2Cys)]2+, V(Pic)(HCys)]+, V(Pic)(Cys) and V2O(Pic)(Cys)]+. The vanadium(III)-picolinic acid-histidine system contained the following complexes: V(Pic)(HHis)]2+, V(Pic)(His)]+, V(Pic)(His)(OH) and V(Pic)2(HHis)]+. In the vanadium(III)-picolinic acid-aspartic acid system the model obtained was: V(Pic)(Asp), V(Pic)(Asp)(OH)]− and V2O(Pic)(Asp)]+ and finally, in the vanadium(III)-picolinic acid-glutamic acid system the complexes: V2O(Pic)2(HGlu)2, V(Pic)(HGlu)2 and V(Pic)2(HGlu) were observed. |
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