Liquid—liquid extraction of metal ions by the sulfide podand 1,12-di-2-thienyl-2,5,8,11-tetrathiadodecane |
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| Authors: | Elwira Lachowicz Andrezej Krajewski Mirosław Goliński |
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| Institution: | Department of Analytical Chemistry, Warsaw University of Technology, PL-00-664 Warsaw Poland;Institute of Organic Chemistry, Polish Academy of Sciences, PL-01-224 Warsaw Poland |
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| Abstract: | The sulfide podand (an open-chain neutral mutlidentate ligand with six sulfur donor atoms) 1,12-di-2-thienyl-2,5,8,11-tetrathiadodecane (TTD) was synthesized. Its extracting properties were examined with 1,2-dichloroethane and 4-methylpentan-2-one as solvents. The reagent showed high selectivity for silver(I) and copper(I) ions; mercury(II) was extracted (ca. 97%) under certain conditions. Extraction of silver(I) was studied in detail with 110mAg tracer. Log D values ?2 were obtained for the range from pH 6 (with perchlorate as counter-ion) to 2 M perchloric acid or 6 M nitric acid. The ratio of Ag:TTD in the complex was 1:1. Silver could be back-extracted with 4–6 M hydrochloric acid. |
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