Abstract
Ternary complex formation reactions were studied between vanadium(III), dipicolinic acid and small molecular weight blood serum components: lactic, oxalic, citric and ortophosphoric acids. The electromotive force measurement permitted us to determine the chemical speciation of the complexes formed. In the vanadium(III)–dipicolinic acid–lactic acid system the complexes detected were: V(dipic)(lac), V(dipic)(lac)(OH)− and V(dipic)(lac)\((\mathrm{OH})_{2}^{2-}\). In the vanadium(III)–dipicolinic acid–oxalic acid system the observed complexes were: V(dipic)(ox)−, V(dipic)(ox)(Hox)2− and V(dipic)\((\mathrm{ox})_{2}^{3-}\). In the vanadium(III)–dipicolinic acid–citric acid system the complexes V(dipic)(Hcit)−, V(dipic)(cit)2−, V(dipic)(cit)(OH)3−, V(dipic)(cit)\((\mathrm{OH})_{2}^{4-}\) and V(dipic)(cit)\((\mathrm{OH})_{3}^{5-}\) were detected. Finally in the vanadium(III)–dipicolinic acid–phosphoric acid system the complexes V(dipic)(H2PO4) and V(dipic)(HPO4)− were observed. The UV-vis spectra allowed us to perform a qualitative characterization of the complexes formed in aqueous solution.
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