EXTRACTION BEHAVIOR OF SOFT METAL IONS WITH POLYTHIOETHER DERIVATIVES CONTAINING O OR N DONOR ATOMS

摘要

Three new polythioether derivatives containing an oxygen or a nitrogen atom in the molecules were synthesized. The liquid-liquid extraction of several metal ions with 1,9-diphenyl-2,5,8-trithianonane (9-2Ph-SSS), 1,9-diphenyl-5-oxa-2,8-dithianonane (9-2Ph-SOS) and 1,9-diphenyl-5-aza-2,8-dithianonane (9-2Ph-SNS) were examined. The aqueous solution containing the metal ion and counter anion such as picrate ion were shaken with a 1,2-dichloroethane solution of the reagent. Soft metal ions such as silver(I), copper(I), palladium(II), mercury(II) and gold(III) were extracted well with these three reagents. On the other hand, the hard and the intermediate metal ions were not extracted at all with these reagents. The extraction efficiency of copper(I) and palladium(II) were relatively low in the case of 9-2Ph-SOS. The extraction behaviors of soft metal ions with these reagents were characterised by the kind of donor atom in the center position of the molecules.