caa a22 4500 445327545 CHVBK 20180317142725.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10953-011-9704-4 doi (NATIONALLICENCE)springer-10.1007/s10953-011-9704-4 Speciation of the Ternary Complexes of Vanadium(III)-Dipicolinic Acid with the Amino Acids Glycine, Proline, α -Alanine and β -Alanine Studied in 3.0 mol⋅dm−3 KCl at 25 °C [Elektronische Daten] [Carmen Batista, José Martínez, Mary Araujo, Felipe Brito, Giuseppe Lubes, Mildred Rodríguez, Vito Lubes] In this paper we present speciation results for the ternary vanadium(III)-dipicolinic acid (H2dipic) systems with the amino acids glycine (Hgly), proline (Hpro), α-alanine (Hα-ala), and β-alanine (Hβ-ala), obtained by means of electromotive forces measurements emf(H) using 3.0mol⋅dm−3 KCl as the ionic medium and a temperature of 25 °C. The experimental data were analyzed by means of the computational least-squares program LETAGROP, taking into account hydrolysis of the vanadium(III) cation, the respective stability constants of the binary complexes, and the acid base reactions of the ligands, which were kept fixed during the analysis. In the vanadium(III)-dipicolinic acid-glycine system, formation of the ternary [V(Hdipic)(Hgly)]2+, [V(dipic)(Hgly)]+, [V(dipic)(gly)], [V(dipic)(gly)(OH)]− and [V(dipic)(gly)(OH)2]2− was observed; in the case of the vanadium(III)-dipicolinic acid-proline system the ternary complexes [V(Hdipic) (Hpro)]2+, [V(dipic)(Hpro)]+, [V(dipic)(pro)] and [V(dipic)(pro)(OH)]− were observed; in the vanadium(III)-picolinic acid-α-alanine were observed [V(Hdipic)(Hα-ala)]2+, [V(dipic) (Hα-ala)]+, [V(dipic)(αala)], [V(dipic)(α-ala)(OH)]− and [V(dipic)(α-ala)(OH)2]2−; and in the vanadium(III)-dipicolinic acid-β-ala system the complexes [V(dipic) (Hβ-ala)]+, [V(dipic)(β-ala)], [V(dipic)(β-ala)(OH)]− and [V(dipic)(β-ala)(OH)2]2− were observed. Their respective stability constants were determined, and we evaluated values of Δlog 10 K″ in order to understand the relative stability of the ternary complexes compared to the corresponding binary ones. The species distribution diagrams are briefly discussed as a function of pH. Springer Science+Business Media, LLC, 2011 Vanadium(III) nationallicence Dipicolinic acid nationallicence Amino acid nationallicence Potentiometric studies nationallicence Ternary complexes nationallicence Batista Carmen Centro de Equilibrios en Solución, Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela (UCV), Caracas, Venezuela aut Martínez José Centro de Equilibrios en Solución, Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela (UCV), Caracas, Venezuela aut Araujo Mary Centro de Equilibrios en Solución, Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela (UCV), Caracas, Venezuela aut Brito Felipe Centro de Equilibrios en Solución, Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela (UCV), Caracas, Venezuela aut Lubes Giuseppe Departamento de Química, Universidad Simón Bolívar (USB), Apartado 89000, 1080 A, Caracas, Venezuela aut Rodríguez Mildred Departamento de Química, Universidad Simón Bolívar (USB), Apartado 89000, 1080 A, Caracas, Venezuela aut Lubes Vito Departamento de Química, Universidad Simón Bolívar (USB), Apartado 89000, 1080 A, Caracas, Venezuela aut Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/6(2011-06-01), 944-954 0095-9782 40:6<944 2011 40 10953 https://doi.org/10.1007/s10953-011-9704-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10953-011-9704-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Batista Carmen Centro de Equilibrios en Solución, Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela (UCV), Caracas, Venezuela aut NATIONALLICENCE 700 1- Martínez José Centro de Equilibrios en Solución, Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela (UCV), Caracas, Venezuela aut NATIONALLICENCE 700 1- Araujo Mary Centro de Equilibrios en Solución, Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela (UCV), Caracas, Venezuela aut NATIONALLICENCE 700 1- Brito Felipe Centro de Equilibrios en Solución, Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela (UCV), Caracas, Venezuela aut NATIONALLICENCE 700 1- Lubes Giuseppe Departamento de Química, Universidad Simón Bolívar (USB), Apartado 89000, 1080 A, Caracas, Venezuela aut NATIONALLICENCE 700 1- Rodríguez Mildred Departamento de Química, Universidad Simón Bolívar (USB), Apartado 89000, 1080 A, Caracas, Venezuela aut NATIONALLICENCE 700 1- Lubes Vito Departamento de Química, Universidad Simón Bolívar (USB), Apartado 89000, 1080 A, Caracas, Venezuela aut NATIONALLICENCE 773 0- Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/6(2011-06-01), 944-954 0095-9782 40:6<944 2011 40 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer