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Open AccessFeature PaperArticle

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

1
Department of Chemistry, University of Patras, 265 04 Patras, Greece
2
Foundation for Research and Technology-Hellas (FORTH), Institute of Chemical Engineering Sciences (ICE-HT), Platani, P.O. Box 1414, 265 04 Patras, Greece
3
Institute of Nanoscience and Nanotechnology, NCSR “Demokritos”, 153 10 Aghia Paraskevi Attikis, Greece
*
Authors to whom correspondence should be addressed.
Academic Editor: Carl J. Carrano
Molecules 2019, 24(12), 2219; https://doi.org/10.3390/molecules24122219
Received: 13 May 2019 / Revised: 5 June 2019 / Accepted: 11 June 2019 / Published: 13 June 2019
(This article belongs to the Section Inorganic Chemistry)
The goal of this work is to model the nature of the chemical species [CdCl2(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 [CdCl2(phpaoH)2]∙H2O (1∙H2O) and {[CdCl2(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 1H NMR spectra. The preparation and characterization of 1∙H2O provide strong evidence for the existence of the species [CdCl2(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. View Full-Text
Keywords: cadmium(II); coordination chemistry; model studies for liquid-liquid extraction; phenyl 2-pyridyl ketoxime as ligand; 2-pyridyl ketoximes as cadmium(II) extractants; Raman spectra; single-crystal X-ray structures cadmium(II); coordination chemistry; model studies for liquid-liquid extraction; phenyl 2-pyridyl ketoxime as ligand; 2-pyridyl ketoximes as cadmium(II) extractants; Raman spectra; single-crystal X-ray structures
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Mazarakioti, E.C.; Beobide, A.S.; Angelidou, V.; Efthymiou, C.G.; Terzis, A.; Psycharis, V.; Voyiatzis, G.A.; Perlepes, S.P. Modeling the Solvent Extraction of Cadmium(II) from Aqueous Chloride Solutions by 2-pyridyl Ketoximes: A Coordination Chemistry Approach. Molecules 2019, 24, 2219.

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