Lo, Jiunn Yan (2007) Preparation and characterization of bent-shaped liquid crystal containing azobenzene moieties. Universiti Malaysia Sabah. (Unpublished)
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Abstract
The objective of this thesis is to synthesize a compound and to study if the synthesized compound has mesogenic properties. The starting material for the synthesis was ethyl-4-aminobenzoate. This initial step of the synthesis involves the diazonium salt coupling reaction with phenol to obtain ethyl-4-( 4-hydroxyphenylazo) benzoate. The product formed then undergoes Williamson ether synthesis to obtain ethyl-4-( 4-Hexadecyloxy-phenylazo)benzoate. The ester functional group (benzoate) from this compound was hydrolyzed with sodium hydroxide to obtain 4-(4-Hexadecyloxy-phenylazo) benzoic acid. The benzoic acid was reacted with DCC and DMAP in dichloromethane to obtain 1,3-phenylene bis [4-(4-Hexadecyloxyphenylazo)benzoate] as final product that comes with a melting point at the range of 128° - 132°C. FT-IR spectrum of all the particular compounds was obtained to compare the functional groups in both compounds. From infrared spectrum, it indicates that the synthesized compound has almost all the functional group in the molecular structure as Projected. This was then followed by further analysis by using DSC to determine the phase transition temperature as well as the phase transition enthalpy changes.
| Item Type: | Academic Exercise |
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| Keyword: | ethyl-4-aminobenzoate, diazonium salt, DSC, transition temperature, FT-IR spectrum |
| Subjects: | T Technology > TP Chemical technology |
| Department: | SCHOOL > School of Science and Technology |
| Depositing User: | SITI AZIZAH BINTI IDRIS - |
| Date Deposited: | 27 Jan 2014 13:23 |
| Last Modified: | 11 Oct 2017 12:38 |
| URI: | https://eprints.ums.edu.my/id/eprint/8054 |
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