Liquid-Liquid Extraction of Metal Ions by Cyclic and Acyclic Tetrathio Ethers

抄録

Liquid-liquid extraction of metal ions with several cyclic and acyclic tetrathio ethers was examined using picrate as the anion of the ion pair. Three new acyclic compounds were synthesized. Class b metal such as Ag(I), Cu(I), Pd(II) and Hg(II) were extracted well, whereas class a and class ab metals were not extracted at all except for Cu(II) with each ligand, regardless of its being cyclic and acyclic tetrathio ethers. The extraction behavior of copper(I) was stoichiometrically examined. Copper(I) was extracted with five ligands(L) into 1, 2-dichloroethane as ion pair compounds, [Cu(I)L]⁺Pic^-. The extraction constant K_ex for copper(I) with each ligand was determined. Copper(I) is most effectively extracted with the tetrathio ether of the o-xylene derivative. It becomes clear that the configuration of ligands is reflected in the K_ex value.