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Modeling the Solvent Extraction of Cadmium(II) from Aqueous Chloride Solutions by 2-pyridyl Ketoximes: A Coordination Chemistry Approach

The goal of this work is to model the nature of the chemical species [CdCl(2)(extractant)(2)] that are formed during the solvent (or liquid-liquid) extraction of the toxic cadmium(II) from chloride-containing aqueous media using hydrophobic 2-pyridyl ketoximes as extractants. Our coordination chemis...

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Detalles Bibliográficos
Autores principales: Mazarakioti, Eleni C., Beobide, Amaia Soto, Angelidou, Varvara, Efthymiou, Constantinos G., Terzis, Aris, Psycharis, Vassilis, Voyiatzis, George A., Perlepes, Spyros P.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6631265/
https://www.ncbi.nlm.nih.gov/pubmed/31200586
http://dx.doi.org/10.3390/molecules24122219
Descripción
Sumario:The goal of this work is to model the nature of the chemical species [CdCl(2)(extractant)(2)] that are formed during the solvent (or liquid-liquid) extraction of the toxic cadmium(II) from chloride-containing aqueous media using hydrophobic 2-pyridyl ketoximes as extractants. Our coordination chemistry approach involves the study of the reactions between cadmium(II) chloride dihydrate and phenyl 2-pyridyl ketoxime (phpaoH) in water-containing acetone. The reactions have provided access to complexes [CdCl(2)(phpaoH)(2)]∙H(2)O (1∙H(2)O) and {[CdCl(2)(phpaoH)]}(n) (2); the solid-state structures of which have been determined by single-crystal X-ray crystallography. In both complexes, phpaoH behaves as an N,N’-bidentate chelating ligand. The complexes have been characterized by solid-state IR and Raman spectra, and by solution (1)H NMR spectra. The preparation and characterization of 1∙H(2)O provide strong evidence for the existence of the species [CdCl(2)(extractant)(2)] that have been proposed to be formed during the liquid-liquid extraction process of Cd(II), allowing the efficient transfer of the toxic metal ion from the aqueous phase into the organic phase.