Extraction behaviour of copper(II) and silver(I) with a thiacrown ether carboxylic acid, 2-(3,6,10,13-tetrathiacyclotetradec-1-oxy)hexanoic acid

The extraction behaviour of copper(II) and silver(I) with 2-(3,6,10;13-tetrathiacyclotetradec-1-oxy)hexanoic acid (TTCTOHA) was investigated at 25 +/- 0.1 degrees C and ionic strength of 0.1. The value of the logarithmic distribution coefficient, log K-DR of TTCTOHA between octan-1-ol and aqueous phases was determined to be 4.13. Copper(II) was extracted with TTCTOHA into octan-1-ol as CuL2, where L represents the anionic species of TTCTOHA. The logarithmic extraction constant, log K-ex(10), was determined at - 7.42. Silver(I) was extracted with TTCTOHA into octan-1-ol as AgL and Ag2L2. The logarithmic distribution constant, log K-DC, of AgL was estimated to be 0.49. On the other hand, silver(I) was extracted into 1,2-dichloroethane as AgL and the logarithmic extraction constant, log K-ex(10), was determined to be - 2.24. (C) 1998 Elsevier Science B.V. All rights reserved.