Sythesis of banana shape liquid crystals and determination of phase transition behavior

Lau, Kah Siew (2005) Sythesis of banana shape liquid crystals and determination of phase transition behavior. Universiti Malaysia Sabah. (Unpublished)


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This thesis has attained it objective specifically synthesized liquid crystal compound that exhibit mesogenic properties and banana shaped structured. Starting material for this project was ethyl 4-aminobenzoate. The initial step was diazonium salt coupling reaction with 4-flourophenol to obtain 4-(4-ethyl-diazobenzoate) fluorophenol, which melting point at the range 170 - 172° C. The next reaction was Wil1iamson eter reaction with l-bromohexadecane to obtain [4-( 4-ethyl-diazobenzoate) fluorophenoloxy] hexadecane that melting point at the range 81 - 84° C. Ester was converted to acid form by hydrolyzed with strong alkali to obtain [4-(4-ethyldiazobenzoate) fluorophenylazo] benzoic acid that melting point comes at the range 196 - 200°C. Product formed was undergoes esterification reaction with catechol, DMAP and DCC to obtain 1,2,-phenylene bis [4-( 4-ethyl-diazobenzoate) tluorophenylazo] benzoate. This compound has melting point at the range 104 - 108°C. Functional group in each product formed will compared with the functional group of the product formed in the next reaction with FT -lR. It has been discovered that all product formed have functional groups such as azo group, C-H bending, C=O stretcing, phenol group and C-O-C bonding.

Item Type: Academic Exercise
Uncontrolled Keywords: liquid crystal, exhibit mesogenic, banana shaped structured, azo group, reaction
Subjects: Q Science > QD Chemistry
Divisions: SCHOOL > School of Science and Technology
Date Deposited: 31 Oct 2013 07:48
Last Modified: 17 Oct 2017 05:17

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