Palladium(II) Extraction by 4-[(Hexylsulfanyl)methyl]-3,5-dimethyl-1-phenyl-1Н-pyrazole from Hydrochloric Acid Solutions

Palladium(II) extraction from hydrochloric acid solutions by 4-[(hexylsulfanyl)methyl]-3,5-dimethyl-1-phenyl-1 Н -pyrazole, a new complexing reagent dissolved in toluene or chloroform, was studied. The reagent showed high efficiency in palladium(II) recovery from 0.1–(5–6) М HCl. Palladium(II) is re...

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Bibliographic Details
Published in:Russian journal of inorganic chemistry 2020, Vol.65 (1), p.106-112
Main Authors: Anpilogova, G. R., Baeva, L. A., Nugumanov, R. M., Fatykhov, A. A., Murinov, Yu. I.
Format: Article
Language:English
Subjects:
Aluminum
Chemistry
Chemistry and Materials Science
Chloroform
Copper compounds
Endothermic reactions
Hydrochloric acid
Inorganic Chemistry
NMR spectroscopy
Palladium
Physical Chemistry of Solutions
Platinum
Pyrazole
Reagents
Toluene
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Summary:Palladium(II) extraction from hydrochloric acid solutions by 4-[(hexylsulfanyl)methyl]-3,5-dimethyl-1-phenyl-1 Н -pyrazole, a new complexing reagent dissolved in toluene or chloroform, was studied. The reagent showed high efficiency in palladium(II) recovery from 0.1–(5–6) М HCl. Palladium(II) is recovered from 1 М HCl by the nonprotonated reagent species according to the coordination mechanism to form the extracted compound [PdCl 2 μ-L] n ( n > 2). The reagent is coordinated to metal ions via the nitrogen atom and the thioether sulfur atom as shown by 1 H and 13 С NMR spectroscopy. In the temperature range 10–40°С, palladium(II) extraction from 1 M HCl is an endothermic process. The palladium(II) can be quantitatively stripped by a hydrochloric acid solution of thiourea. The reagent (with toluene as diluent) may be recommended for use in palladium(II) concentration from hydrochloric acid solutions and for palladium(II) selective separation from platinum(IV), copper(II), nickel(II), iron(III), and aluminum(III).
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023620010027