Palladium(II) Extraction
by N, N '-Dipentylethylenediamine-N'-thiocarbaldehyde
from Hydrochloric Acid Solutions

R. A. Khisamutdinov, V. V. Potapov, Yu. I. Murinov, and V. P. Krivonogov

Institute of Organic Chemistry, Ufa Scientific Center, Russian Academy of Sciences, Ufa, Russia

Received November 14, 1999

Abstract—Palladium(II) extraction at 25°C by N,N '-dipentylethylenediamine-N '-thiocarbaldehyde (L) from
HCl solutions was studied. An extraction equilibrium is found to be established within one minute. The metal ion
is extracted from 0.5 M HCl solutions (with toluene or chloroform as a diluent) by the ion-exchange–solvation
mixed mechanism in the form of the complex cis-PdCl₂(L · HCl)₂ given an excess extractant (Pd : L 1 : 2). At
higher palladium(II) concentrations, cis-[PdCl₂(L · H)₂][PdCl₄] is separated as a third phase from extracts in
the case of extraction by L to chloroform, and trans-[PdCl₂(L · H)₂][PdCl₄], in the case of extraction by L to
toluene. Thermodynamic parameters and apparent concentration constants of extraction were determined.

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