caa a22 4500 445327456 CHVBK 20180317142725.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10953-010-9624-8 doi (NATIONALLICENCE)springer-10.1007/s10953-010-9624-8 Speciation of the Ternary Complexes ofVanadium(III)-Dipicolinic Acid and the Amino Acids Cysteine, Histidine, Aspartic and Glutamic Acids in3.0 mol⋅dm−3 KCl at 25 °C [Elektronische Daten] [Isaida Shiozawa, Giuseppe Lubes, Mildred Rodríguez, Vito Lubes] In this work we present results for the speciation of the ternary complexes formed in the aqueous vanadium(III)-dipicolinic acid and the amino acids cysteine (H2cys), histidine (Hhis), aspartic acid (H2asp) and glutamic acid (H2glu) systems (25 °C; 3.0 mol⋅dm−3 KCl as ionic medium), determined by means of potentiometric measurements. The potentiometric data were analyzed with the least-squares program LETAGROP, taking into account the hydrolysis of vanadium(III), the acid-base reactions of the ligands, and the binary complexes formed. Under the experimental conditions (vanadium(III) concentration = 2-3 mmol⋅dm−3 and vanadium(III): dipicolinic acid: amino acid molar ratio 1:1:1, 1:1:2 and 1:2:1), the following species [V(dipic)(H2asp)]+, [V(dipic)(Hasp)], [V(dipic)(asp)]−, [V(dipic)(asp)(OH)]2−, and [V(dipic)(asp)(OH)2]3− were found in the vanadium(III)-dipicolinic acid-aspartic acid system. In the vanadium(III)-dipicolinic acid-glutamic acid system [V(Hdipic)(H2glu)]2+, [V(dipic)(H2glu)]+, [V(dipic)(Hglu)], [V(dipic)(Hglu)(OH)]−, and [V(dipic)(Hglu)(OH)2]2− were observed. In the vanadium(III)-dipicolinic acid-cysteine system the complexes [V(dipic)(H2cys)]+, [V(dipic)(Hcys)], [V(dipic)(cys)]−, and [V(dipic)(cys)(OH)]2− were present. And finally, in the vanadium(III)-dipicolinic acid-histidine system the complexes [V(Hdipic)(Hhis)]2+, $[\mathrm{V}(\mathrm{dipic}) (\mathrm{Hhis})]^{+}$, [V(dipic)(his)], [V(dipic)(his)(OH)]−, and [V(dipic)(his)(OH)2]2− were observed. The stability constants of these complexes were determined. The species distribution diagrams as a function of pH are briefly discussed. Springer Science+Business Media, LLC, 2010 Vanadium(III) complexes nationallicence Dipicolinic acid nationallicence Potentiometric studies nationallicence Speciation nationallicence Ternary complexes nationallicence Shiozawa Isaida Departamento de Química, Universidad Simón Bolívar (USB), Apartado 89000, 1080 A, 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 40/1(2011-01-01), 17-25 0095-9782 40:1<17 2011 40 10953 https://doi.org/10.1007/s10953-010-9624-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10953-010-9624-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shiozawa Isaida Departamento de Química, Universidad Simón Bolívar (USB), Apartado 89000, 1080 A, 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 40/1(2011-01-01), 17-25 0095-9782 40:1<17 2011 40 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer