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Novel heteroarene complexes of chromium (O)
Dissertation (MSc)--University of Pretoria, 1997.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2022
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| _version_ | 1867613550806040576 |
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| access_status_str | Open Access |
| author2 | Lotz, Simon |
| author_browse | Lotz, Simon |
| author_facet | Lotz, Simon |
| collection | Thesis |
| dc_rights_str_mv | © 2020 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc)--University of Pretoria, 1997. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/85294 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:56.361Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/85294 Novel heteroarene complexes of chromium (O) Lotz, Simon Landman, Marile UCTD Novel heteroarene complexes chromium Dissertation (MSc)--University of Pretoria, 1997. Novel π-heteroarene complexes of the type (T16-arene)Cr(CO)3 were synthesized. The reactivity of thio- and nitro-heteroarene rings towards TI-coordination to a Cr(CO)3-moiety were investigated. Two different synthetic routes were implemented to synthesize'the TI-coordinated products. It was found that the thio-heteroarene complexes were obtained in a high yield on treatment with trisamrnine(tricarbonyl)chromium, while higher yields were obtained for the nitroheteroarene complexes on treatment with hexacarbonylchromium. The arene ligands under investigation were 3,6-dimethylthieno[3,2-b ]thiophene, quinoline and phenazine. The synthesis of the (116-quinoline)Cr(CO)3 complex has proved to be more arduous than was expected and several methods were implemented to synthesize the desired product. In the end two products were isolated, both TI-coordinated to a Cr(CO)3-moiety, but neither resembling the target complex. Instead, nucleophilic addition occurred at the 2-position of both products and the lone pair of the nitrogen atom was blocked by a substituent. These complexes were fully characterized and the proposed structure formulations were confirmed by single crystal X-ray determinations. Known (T16-arene)Cr(CO)3 complexes were investigated with regard to activation and stabilization of the bridging arene ligand. The ligands benzo[ b ]thiophene and dibenzothiophene were monolithiated and treated with group IV (Ti), group VII (Mn, Re) and group X (Pt) transition metals at low temperatures to yield a,1t-bimetallic heteroarene complexes. The first o, π-bimetallic dibenzothiophene complexes were synthesized by this method. The yields of these complexes were, however, very low. From the spectroscopic data it was clear that the activation of the dibenzothiopheneCr(CO)3 complex towards coordination to the second metal, i.e. the a-bonded species, occurred on the same ring fragment as where the TI-coordination took place. In an attempt to improve the yield, another synthetic route was investigated and this led to the preparation of the a-dibenzothiophene complex, 111-dibenzothienyl-Re(CO)5. The synthetic method using this a-complex as precursor was unfortunately unsuccessful. All the new bimetallic compounds were fully characterized by means of NMR spectroscopy, infrared spectroscopy as well as mass spectrometry. Chemistry MSc Unrestricted 2022-05-17T11:19:57Z 2022-05-17T11:19:57Z 2021/11/08 1997 Dissertation * https://repository.up.ac.za/handle/2263/85294 en © 2020 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Novel heteroarene complexes chromium Novel heteroarene complexes of chromium (O) |
| title | Novel heteroarene complexes of chromium (O) |
| title_full | Novel heteroarene complexes of chromium (O) |
| title_fullStr | Novel heteroarene complexes of chromium (O) |
| title_full_unstemmed | Novel heteroarene complexes of chromium (O) |
| title_short | Novel heteroarene complexes of chromium (O) |
| title_sort | novel heteroarene complexes of chromium o |
| topic | UCTD Novel heteroarene complexes chromium |
| url | https://repository.up.ac.za/handle/2263/85294 |