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Ternary Complex Formation between Vanadium(III), Dipicolinic Acid and Picolinic Acid in Aqueous Solution

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Abstract

Ternary complex species formed by the V3+ cation with the picolinic acid (Hpic, HL) and dipicolinic acid (H2dipic, H2L) ligands in aqueous solutions have been studied potentiometrically (25 °C, I=3.0 mol⋅dm−3 KCl ionic medium) and by spectrophotometric measurements. Application of the least-squares computer program LETAGROP to the experimental emf (H) data, taking into account the hydrolytic V(III) species and the binary V3+–picolinic acid and V3+–dipicolinic acid complexes, shows that under the investigated conditions the following ternary complexes are formed: [V(dipic)(pic)], [V(dipic)(pic)(OH)]− and [V(dipic)(pic)2]−. The stability constants of the ternary complexes were determined by potentiometric measurements whereas the spectrophotometric measurements were done in order to obtain a qualitative characterization of the complexes formed in aqueous solution.

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Authors and Affiliations

  1. Departamento de Química, Universidad Simón Bolívar (USB), Apartado, 89000, Caracas, 1080 A, Venezuela

    Giuseppe Lubes, Mildred Rodríguez & Vito Lubes

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  1. Giuseppe Lubes
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  2. Mildred Rodríguez
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  3. Vito Lubes
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Correspondence to Vito Lubes.

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Lubes, G., Rodríguez, M. & Lubes, V. Ternary Complex Formation between Vanadium(III), Dipicolinic Acid and Picolinic Acid in Aqueous Solution. J Solution Chem 39, 1134–1141 (2010). https://doi.org/10.1007/s10953-010-9577-y

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  • DOI: https://doi.org/10.1007/s10953-010-9577-y

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