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Título : | Mixed-ligand complex formation equilibria of vanadium(III) with picolinic and dipicolinic acids with some dicarbxylic acids (oxalic, malonic and phthalic acids) studied in 3.0 M KCl at 25 °C |
Autor : | Esteves, Ana Escobar, Jessaid Martínez, José Daniel Araujo, Mary Lorena Brito, Felipe Hernández, Lino Del Carpio, Edgar Lubes, Vito |
Palabras clave : | vanadium(III) complexes; picolinic acid; dipicolinic acid; dicarboxylic acids; potentiometric studies; speciation; ternary complexes |
Fecha de publicación : | 19-Jun-2015 |
Resumen : | The ternary complexes formed between vanadium(III) and picolinic acid (Hpic) and dipicolinic acid (H2dipic) with the
10 dicarboxylic oxalic, malonic, and phthalic acids (H2ox), (H2mal), and (H2phtha) briefly (H2 L) were studied in aqueous
solution by means of electromotive forces’ measurements emf(H) at 25 °C and 3.0 mol dm−3 KCl as ionic medium. The
potentiometric data were analyzed using the least-squares computational program LETAGROP, considering the hydrolysis
products of the V(III), the acidity constants of the ligands employed, and the formation constants of the binary complexes,
obtaining the complexes V(pic)(ox), log β1,1,1,−3 = 5.39(7) and [V(pic)2(ox)]−, log β1,2,1,−4 = 4.3(1); V(pic)(ma),
15 log β1,1,1,−3 = 5.58(5) and [V(pic)2(ox)]−, log β1,2,1,−4 = 5.00(8); V(pic)(phtha), log β1,1,1,−3 = 5.66(6) and [V(pic)2(phtha)]−
log β1,2,1,−4 = 4.5(2) in the vanadium(III)-Hpic-H2L system. In the case of the vanadium(III)-H2dipic-H2L system,
the complexes [V(dipic)(ox)]−, log1,1,1,−4 β = 9.3(2), [V(dipic)(Hox)(ox)]2−, log β1,1,2,−5 = 11.2(2) and [V(dipic)(ox)2]3−,
log β1,1,2,.6 = 5.7 max 7.0; [V(dipic)(ma)]−, log β1,1,1,−4 = 8.7(2), [V(dipic)(Hma)(ma)]2−, log β1,1,2,−5 = 10.3(1) and [V
(dipic)(ma)2]3−, log β1,1,2,.6 = 6.9(1); [V(dipic)(phtha)]−, log β1,1,1,−4 = 10.9(1), [V(dipic)(Hphtha)(phtha)]2−, log
20 β1,1,2,−5 = 9.2 max 10.4 and [V(dipic)(phtha)2]3−, log β1,1,2,.6 = 6.9(3) were observed. |
URI : | http://hdl.handle.net/10872/10193 |
Aparece en las colecciones: | Artículos Publicados
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