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Design, synthesis and characterization of water soluble heterobimetallic complexes and their evaluation as aqueous biphasic hydroformylation catalysts
Includes bibliographical references
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| Main Author: | |
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Chemistry
2016
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| _version_ | 1867613179778957312 |
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| access_status_str | Open Access |
| author | Siangwata, Shepherd |
| author2 | Smith, Gregory S |
| author_browse | Siangwata, Shepherd Smith, Gregory S |
| author_facet | Smith, Gregory S Siangwata, Shepherd |
| author_sort | Siangwata, Shepherd |
| collection | Thesis |
| description | Includes bibliographical references |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/16791 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:00.945Z |
| 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:11427/16791 Design, synthesis and characterization of water soluble heterobimetallic complexes and their evaluation as aqueous biphasic hydroformylation catalysts Siangwata, Shepherd Smith, Gregory S Makhubela, Banothile C E Chemistry Includes bibliographical references A series of new water-soluble N,O-chelating Schiff base ligands were synthesised. These ligands were reacted with ferrocenecarboxaldehyde through Schiff base condensation reactions, leading to new water-soluble ferrocenylimine mononuclear complexes. The mononuclear complexes were reacted with a dimeric rhodium precursor [RhCl(COD)]2 to produce a series of novel ferrocenylimine-Rh(I) heterobimetallic complexes. Both themononuclear and heterobimetallic complexes were found to have good solubility in water of up to 11 mg/mL. The complexes were characterised fully using various spectroscopic and analytical techniques including 1H NMR, 13C NMR spectroscopy, FT-IR spectroscopy, mass spectrometry and elemental analysis. In addition, mononuclear and heterobimetallic complexes were also synthesised as precursors to dendritic DAB-G1 structures. These were found to be water-soluble and they were also characterised using spectroscopic and analytical techniques. The two monometallic and two heterobimetallic complexes were evaluated as pre-catalysts for the aqueous biphasic hydro formylation of 1-octene.The mononuclear ferrocenyl complexes were inactive in the aqueous biphasic hydroformylation experiments. Hydroformylation using the heterobimetallic complexes showed that the pre-catalysts are active in 1-octene conversion, yielding aldehydes (linear and branched) as well as isomerisation products (cis and trans 2- and 3-octene). Linear aldehydes were more favoured with the tertiary-butyl analogue of the heterobimetallic complex. Although loss of metal from the aqueous layer was detected using ICP-OES, the catalysts exhibited good recyclability and could be reused up to 4 times. 2016-02-05T07:26:15Z 2016-02-05T07:26:15Z 2015 Master Thesis Masters MSc http://hdl.handle.net/11427/16791 eng application/pdf Department of Chemistry Faculty of Science University of Cape Town |
| spellingShingle | Chemistry Siangwata, Shepherd Design, synthesis and characterization of water soluble heterobimetallic complexes and their evaluation as aqueous biphasic hydroformylation catalysts |
| thesis_degree_str | Master's |
| title | Design, synthesis and characterization of water soluble heterobimetallic complexes and their evaluation as aqueous biphasic hydroformylation catalysts |
| title_full | Design, synthesis and characterization of water soluble heterobimetallic complexes and their evaluation as aqueous biphasic hydroformylation catalysts |
| title_fullStr | Design, synthesis and characterization of water soluble heterobimetallic complexes and their evaluation as aqueous biphasic hydroformylation catalysts |
| title_full_unstemmed | Design, synthesis and characterization of water soluble heterobimetallic complexes and their evaluation as aqueous biphasic hydroformylation catalysts |
| title_short | Design, synthesis and characterization of water soluble heterobimetallic complexes and their evaluation as aqueous biphasic hydroformylation catalysts |
| title_sort | design synthesis and characterization of water soluble heterobimetallic complexes and their evaluation as aqueous biphasic hydroformylation catalysts |
| topic | Chemistry |
| url | http://hdl.handle.net/11427/16791 |
| work_keys_str_mv | AT siangwatashepherd designsynthesisandcharacterizationofwatersolubleheterobimetalliccomplexesandtheirevaluationasaqueousbiphasichydroformylationcatalysts |