Synthesis of V-shaped liquid crystals having nitro groups as terminal

Kuiek, Bee Suan (2007) Synthesis of V-shaped liquid crystals having nitro groups as terminal. Universiti Malaysia Sabah. (Unpublished)


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The main objectives of the study were to synthesized V-shaped liquid crystals materials with mesogenic properties. 4-Nitroaniline was used as a starting material for the synthesis. The peripheral cores were prepared from 4-Nitroaniline in which the amino group was diazotized by sodium nitrite and the obtained diazonium salt was coupled with phenol to yield 4-(4-nitrophenylazo)phenol. The obtained compound was used for the Williamson ether synthesis to obtained I-bromo-4-( 4- nitrophenylazo )phenoxyhexane. The target molecule 1, 2-bis-[ {4-(4- nitrophenylazo )phenoxy} hexyloxy]benzene was prepared by I-bromo-4-( 4- nitrophenylazo)phenoxyhexane was used to dialkylate catechol in the presence of potassium carbonate and potassium iodide. Melting point of the final compound was in the range between 68 °C to 74 °C. From the obtained IR spectra, the functional groups in both compounds, I-bromo-4-( 4-nitrophenylazo )phenoxyhexane and 1,2-bis- [ {4-( 4-nitrophenylazo )phenoxy} hexyloxy]benzene was compared. The spectrum showed that the synthesized compound had all the functional groups as in the projected molecular structure. The mesomorphic properties of final compound were investigated by differential scanning calorimetry (DSC). However, from the DSC study, the compound did not show liquid crystal phase.

Item Type: Academic Exercise
Uncontrolled Keywords: V-shaped liquid crystal, 4-Nitroaniline, melting point, differential scanning calorimetry, mesomorphic
Subjects: T Technology > TP Chemical technology > TP368-456 Food processing and manufacture
Divisions: SCHOOL > School of Science and Technology
Date Deposited: 24 Mar 2014 06:02
Last Modified: 13 Oct 2017 01:34

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