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Studies with dithizone : the extraction of thallium (III)
Bibliography: pages 141-144.
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Chemistry
2016
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| _version_ | 1867613790907924480 |
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| access_status_str | Open Access |
| author | Sacht, Cheryl |
| author2 | Irving, H M N H |
| author_browse | Irving, H M N H Sacht, Cheryl |
| author_facet | Irving, H M N H Sacht, Cheryl |
| author_sort | Sacht, Cheryl |
| collection | Thesis |
| description | Bibliography: pages 141-144. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/22161 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:41:45.355Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Chemistry |
| publisherStr | Department of Chemistry |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/22161 Studies with dithizone : the extraction of thallium (III) Sacht, Cheryl Irving, H M N H Koch, Klaus R Chemistry Bibliography: pages 141-144. Thallium(III) reacts with dithizone(I) in a complicated way through a number of intermediate products which depend on the relative proportions of reactants, the pH of the aqueous phase, the order of mixing of reactants, the time of phase equilibrium and the nature of the organic solvent used. The reaction between thallium(III) and dithizone is essentially oxidative in character. In the present work the complete reaction scheme is proposed: Thallium(III) reacts with dithizone to give a thallic-dithizonate complex, [TlIII(HDz)₃], which spontaneously and oxidatively disproportionates to the disulphide (III) and a thallium(I)-dithizonate complex, [Tl(HDz)]. The disulphide(III) decomposes by first-order heterolytic fission to give equimolar amounts of dithizone and the mesoionic compound (IV) . The Tl(HDz) complex undergoes reversion to give Tl+ in the aqueous phase and dithizone in the organic phase. In the presence of excess thallium(III) the regenerated dithizone is oxidized to the mesoionic compound (IV): the mesoionic compound (IV), partitions between the two phases and appears to react with excess thallium(III) to give possibly a mesoionic compound (IV)-thallium(III) complex and an unspecified oxidation product. The molecular structure of the 1 : 1 adduct formed between diphenylthallium( III) and dithizone has been shown by single crystal X-ray diffraction, to be a five co-ordinate diphenylthallium(III) complex: the dithizone acts as a bidentate chelating ligand co-ordinating through the nitrogen and sulphur atoms. Ethanol (solvent of recrystallisation) co-ordinates in the fifth position. 2016-10-16T09:51:57Z 2016-10-16T09:51:57Z 1985 Master Thesis Masters MSc http://hdl.handle.net/11427/22161 eng application/pdf Department of Chemistry Faculty of Science University of Cape Town |
| spellingShingle | Chemistry Sacht, Cheryl Studies with dithizone : the extraction of thallium (III) |
| thesis_degree_str | Master's |
| title | Studies with dithizone : the extraction of thallium (III) |
| title_full | Studies with dithizone : the extraction of thallium (III) |
| title_fullStr | Studies with dithizone : the extraction of thallium (III) |
| title_full_unstemmed | Studies with dithizone : the extraction of thallium (III) |
| title_short | Studies with dithizone : the extraction of thallium (III) |
| title_sort | studies with dithizone the extraction of thallium iii |
| topic | Chemistry |
| url | http://hdl.handle.net/11427/22161 |
| work_keys_str_mv | AT sachtcheryl studieswithdithizonetheextractionofthalliumiii |