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Negative thermal expansion of organic compounds
Thesis (MSc)--Stellenbosch University, 2011.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2011
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| _version_ | 1867613973369585664 |
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| access_status_str | Open Access |
| author | Greyling, Guillaume Hermanus |
| author2 | Barbour, Leonard J. |
| author_browse | Barbour, Leonard J. Greyling, Guillaume Hermanus |
| author_facet | Barbour, Leonard J. Greyling, Guillaume Hermanus |
| author_sort | Greyling, Guillaume Hermanus |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MSc)--Stellenbosch University, 2011. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/6896 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:44:38.662Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2011 |
| publishDateRange | 2011 |
| publishDateSort | 2011 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/6896 Negative thermal expansion of organic compounds Greyling, Guillaume Hermanus Barbour, Leonard J. Stellenbosch University. Faculty of Science. Dept. of Chemistry and Polymer Science. Crystallography Expansion (Heat) Organic compounds -- Thermal properties Theses -- Chemistry Dissertations -- Chemistry Chemistry Thesis (MSc)--Stellenbosch University, 2011. ENGLISH ABSTRACT: The primary objective of the work was to investigate the negative thermal expansion of organic materials and to determine the mechanisms governing this phenomenon by using the principles of crystal engineering. To this end, the following three compounds were studied in detail: • 4,4'-Diiodobiphenyl • 4-Iodobenzoic acid • Methyl Paraben The rationale behind this work was to determine the mechanisms responsible for the observed negative thermal expansion and to uncover the structural factors that induce negative thermal expansion. Single-crystal X-ray diffraction was employed as the primary analytical tool, owing to the unique information it can provide regarding intermolecular interactions in the solid state. A total of twenty organic compounds were analysed, of which three exhibited negative thermal expansion. Each compound employs a specific mechanism for negative thermal expansion, two of which are closely related and the third distinct. AFRIKAANSE OPSOMMING: Die hoof doel van hierdie studie was om ondersoek in te stel in die verskynsel van ‘negative thermal expansion’ in organiese materiale en gevolglik die meganisme vas te stel deur die beginsels van kristalmanipulsie (‘crystal engineering’) te gebruik. Gevolglik was drie organise stowwe ondersoek: • 4,4'-Diiodobiphenyl /4,4'-Diiodobifeniel • 4-Iodobenzoic acid /4-Iodobensoësuur • Methyl Paraben Die redenasie hieragter is om die meganisme verantwoordelik vir die ‘negative thermal expansion’ vas te stel en die verskillende faktore wat bydra tot dit te bevestig. Enkel-kristal diffraksie word benut as die primêre analitiese tegniek as gevolg van die unieke inligting wat verkry kan word met betrekking tot die intermolekulêre interaksies. 'n Totaal van twintig stowwe is geanaliseer waarvan drie die spesifieke termisie eienskap besit. Elk van die drie stowwe het ‘n ander meganisme te vore laat kom waarvan twee baie ooreenstem en die derde verskil. 2011-02-15T12:22:10Z 2011-03-15T08:45:47Z 2011-02-15T12:22:10Z 2011-03-15T08:45:47Z 2011-03 Thesis http://hdl.handle.net/10019.1/6896 en_ZA Stellenbosch University application/pdf application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Crystallography Expansion (Heat) Organic compounds -- Thermal properties Theses -- Chemistry Dissertations -- Chemistry Chemistry Greyling, Guillaume Hermanus Negative thermal expansion of organic compounds |
| title | Negative thermal expansion of organic compounds |
| title_full | Negative thermal expansion of organic compounds |
| title_fullStr | Negative thermal expansion of organic compounds |
| title_full_unstemmed | Negative thermal expansion of organic compounds |
| title_short | Negative thermal expansion of organic compounds |
| title_sort | negative thermal expansion of organic compounds |
| topic | Crystallography Expansion (Heat) Organic compounds -- Thermal properties Theses -- Chemistry Dissertations -- Chemistry Chemistry |
| url | http://hdl.handle.net/10019.1/6896 |
| work_keys_str_mv | AT greylingguillaumehermanus negativethermalexpansionoforganiccompounds |