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

Abstract

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°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 CuL 2, 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 Ag 2L 2. 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.