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Speciation of the Vanadium (III) Complexes with 6-Methylpicolinic Acid, Salicylic Acid and Phthalic Acid

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Abstract

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.

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Authors and Affiliations

  1. Centro de Equilibrios en Solución, Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela, Caracas, Venezuela

    María Goncalves, José Daniel Martínez, Mary Lorena Araujo & Felipe Brito

  2. Departamento de Química y Procesos, Universidad Simón Bolívar, Valle de Sartenejas, Baruta, Estado Miranda, Apartado 89000, Caracas, 1080 A, Venezuela

    Giuseppe Lubes, Mildred Rodríguez & Vito Lubes

Authors
  1. María Goncalves
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  2. José Daniel Martínez
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  3. Mary Lorena Araujo
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  4. Felipe Brito
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  5. Giuseppe Lubes
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  6. Mildred Rodríguez
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  7. Vito Lubes
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Correspondence to Vito Lubes.

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Goncalves, M., Martínez, J.D., Araujo, M.L. et al. Speciation of the Vanadium (III) Complexes with 6-Methylpicolinic Acid, Salicylic Acid and Phthalic Acid. J Solution Chem 40, 1517–1527 (2011). https://doi.org/10.1007/s10953-011-9739-6

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  • DOI: https://doi.org/10.1007/s10953-011-9739-6

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