Silver Ion Selective Extraction with Dithiaza-, Tetrathiaza-, and Tetrathiadiazacrown Ether Derivatives

Article abstract of DOI:10.1246/bcsj.68.2831

Dithiazacrown, tetrathiazacrown, and two tetrathiadiazacrown ether derivatives, bearing a phenyl group on each nitrogen atom at the periphery, were synthesized, and the solvent extractions of some transition metal ions with these compounds were carried out using an H2O-1,2-dichloroethane system.All of the thiazacrown compounds employed exhibited Ag⁺ selectivity, and formed 1:1:1 complexes of Ag⁺ : ligand : laurate ion as a counter anion to be extracted into a 1,2-dichloroethane solution.The extractabilities (extraction constants, K_ex) for Ag⁺ decreased in the order: 7,16-diphenyltetrathia-7,16-diaza-18-crown-6 (3) (log K_ex = 1.18+/-0.13) > 13-phenyltetrathia-13-aza-15-crown-5 (2) (0.75+/-0.09) > 7-phenyldithia-7-aza-9-crown-3 (1) (-0.47+/-0.06)>13, 16-diphenyltetrathia-13,16-diaza-18-crwon-6 (4) (-0.62+/-0.16).