The deviations in structure from that of the gas phase have been examined when the technique of liquid, crystal nuclear magnetic resonance (LCNMR) spectroscopy is applied to a series of simple silyl compounds. Both conventional vibrational corrections and an additional correction to account for the correlation between vibration and reorientation of the molecules were applied. This has indicated that the main structural differences are as a result of specific interactions between polar groups from the liquid crystal and the silicon. This interaction takes the form of an S<SUB>N</SUB>2 interaction intermediate as is found in the crystal structures of these silyl compounds. In addition, the crystal structure of two liquid crystals, 4-<I>n</I>-heptyl-4-cyanobiphenyl (7-CB) and 4-<I>n</I>-methoxy-4-cyanobiphenyl (<I>1</I>-OCB) have been determined. The molecular packing of 7-CB and the first seven members of the <I>n</I>-OCB series were then examined and found to be related to mesogenic properties of these compounds on melting.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:657424 |
| Date | January 1995 |
| Creators | Mathieson, Paul James |
| Publisher | University of Edinburgh |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://hdl.handle.net/1842/15281 |
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