Liquid-liquid extraction of silver(I) with aroylthiocarbamic-O-esters influence of the solvents and of the structure of extractants

Five bisbidentate (H2L) and two bidentate (HL) aroylthiocarbamic-O-esters w ere synthesized and used for the liquid-liquid extraction of silver(I). A s ilver(I) complex was characterized in solid state. The distribution ratio D -Ag and the compositions of the extracted complexes were obtained for the s ilver extraction from nitric acid solutions depending on the pH value and t he organic solvent. D-Ag values are decreasing in the sequence of the solve nts decane, decane/toluene, toluene, chloroform. The bisbidentate extractan ts are more effective than the bidentate ones. Hetero atoms in the bridging molecule group of the bisbidentate compounds increase the D-Ag values. The extraction behavior is discussed with regard to the calculated protonation constants and stability constants.