caa a22 4500 445327766 CHVBK 20180317142726.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s10953-011-9739-6 doi (NATIONALLICENCE)springer-10.1007/s10953-011-9739-6 Speciation of the Vanadium (III) Complexes with 6-Methylpicolinic Acid, Salicylic Acid and Phthalic Acid [Elektronische Daten] [María Goncalves, José Martínez, Mary Araujo, Felipe Brito, Giuseppe Lubes, Mildred Rodríguez, Vito Lubes] The complex species formed in aqueous solutions (25 °C, I=3.0 mol⋅dm−3 KCl ionic medium) between the V(III) cation and the ligands 6-methylpicolinic acid (MePic, HL), salicylic acid (H2Sal, H2L) and phthalic acid (H2Phtha, H2L) have been studied by potentiometric and spectrophotometric measurements. Application of the least-squares computer program LETAGROP to the experimental emf(H) data, taking into account the hydrolytic species and hydrolysis constants of V(III), indicates that under the employed experimental conditions the complexes [VL]2+, [V(OH)L]+, [V(OH)2L], [V(OH)3L]−, [VL2]+, [VL3] and [V2OL4] form in the vanadium(III)-MePic system. Were observed the complexes [VL]+, [VL2]−, [V(OH)L2]2− and [VL3]3− in the vanadium(III)-H2Sal system, and the species [VHL]2+, [VL]+, [V(OH)L], [VHL2], [VL2]−, [V(OH)L2]2−, [V(OH)2L2]3− and [VL3]3− in the vanadium(III)-H2Phtha system. The stability constants of these complexes were determined by potentiometric measurements, and spectrophotometric measurements were made in order to perform a qualitative characterization of the complexes formed in aqueous solution. Springer Science+Business Media, LLC, 2011 Vanadium(III) complexes nationallicence Stability constants nationallicence 6-Methylpicolinic acid nationallicence Salicylic acid nationallicence Phthalic acid nationallicence Potentiometric titrations nationallicence Spectrophotometric measurements nationallicence Goncalves María Centro de Equilibrios en Solución, Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela, Caracas, Venezuela aut Martínez José Centro de Equilibrios en Solución, Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela, Caracas, Venezuela aut Araujo Mary Centro de Equilibrios en Solución, Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela, Caracas, Venezuela aut Brito Felipe Centro de Equilibrios en Solución, Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela, Caracas, Venezuela aut Lubes Giuseppe Departamento de Química y Procesos, Universidad Simón Bolívar, Valle de Sartenejas, Baruta, Estado Miranda, Apartado 89000, 1080 A, Caracas, Venezuela aut Rodríguez Mildred Departamento de Química y Procesos, Universidad Simón Bolívar, Valle de Sartenejas, Baruta, Estado Miranda, Apartado 89000, 1080 A, Caracas, Venezuela aut Lubes Vito Departamento de Química y Procesos, Universidad Simón Bolívar, Valle de Sartenejas, Baruta, Estado Miranda, Apartado 89000, 1080 A, Caracas, Venezuela aut Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/9(2011-09-01), 1517-1527 0095-9782 40:9<1517 2011 40 10953 https://doi.org/10.1007/s10953-011-9739-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10953-011-9739-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Goncalves María Centro de Equilibrios en Solución, Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela, Caracas, Venezuela aut NATIONALLICENCE 700 1- Martínez José Centro de Equilibrios en Solución, Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela, Caracas, Venezuela aut NATIONALLICENCE 700 1- Araujo Mary Centro de Equilibrios en Solución, Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela, Caracas, Venezuela aut NATIONALLICENCE 700 1- Brito Felipe Centro de Equilibrios en Solución, Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela, Caracas, Venezuela aut NATIONALLICENCE 700 1- Lubes Giuseppe Departamento de Química y Procesos, Universidad Simón Bolívar, Valle de Sartenejas, Baruta, Estado Miranda, Apartado 89000, 1080 A, Caracas, Venezuela aut NATIONALLICENCE 700 1- Rodríguez Mildred Departamento de Química y Procesos, Universidad Simón Bolívar, Valle de Sartenejas, Baruta, Estado Miranda, Apartado 89000, 1080 A, Caracas, Venezuela aut NATIONALLICENCE 700 1- Lubes Vito Departamento de Química y Procesos, Universidad Simón Bolívar, Valle de Sartenejas, Baruta, Estado Miranda, Apartado 89000, 1080 A, Caracas, Venezuela aut NATIONALLICENCE 773 0- Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/9(2011-09-01), 1517-1527 0095-9782 40:9<1517 2011 40 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer