Wong, Kian Hoe (2007) Synthesis of disc-shaped liquid crystals having six alkyl chains as peripheral. Universiti Malaysia Sabah. (Unpublished)
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Abstract
A novel symmetrical liquid crystalline material comprised of a disc-shaped triphenylene unit as central core and six alkyl substituted chains as peripheral has been synthesised. This final compound, 2,3,6,7,10,11-hexakis{[4-(4-acetylphenylazo) phenoxy ]hexyloxy} triphenylene was synthesised from alkylation of 2,3,6,7,10,11- hexahydroxytriphenylene with I-bromo[ 4-( 4-acetylphenylazo ) phenoxy ]hexane in the presence of potassium carbonate as base and potassium iodide as catalyst. Spectroscopic analysis which are nuclear magnetic resonance (NMR) and fourier transform infrared spectroscopy (FT-IR) were utilised to identify the molecular structure of final triphenylene compound. The 1H NMR and FT-IR spectra show the presence of triphenylenes, aliphatic alkyl chains, azobenzene moieties and acetyl functional groups for this disc-shaped molecule. The phase transition temperatures and enthalpies were measured by thermal analysis of differential scanning calorimetry (DSC). The result of thermogram reveals two lower exothermic cooling points at 96.27 °C and 70.23 °C for crystallisation of compound.
| Item Type: | Academic Exercise |
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| Keyword: | disc-shaped triphenylene, alkyl, synthesis, thermogram, crystal |
| Subjects: | Q Science > QD Chemistry |
| Department: | SCHOOL > School of Science and Technology |
| Depositing User: | SITI AZIZAH BINTI IDRIS - |
| Date Deposited: | 13 Jun 2013 12:51 |
| Last Modified: | 16 Oct 2017 14:54 |
| URI: | https://eprints.ums.edu.my/id/eprint/6264 |
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