Synthesis of disc-shaped liquid crystals having six alkyl chains as peripheral

Wong, Kian Hoe (2007) Synthesis of disc-shaped liquid crystals having six alkyl chains as peripheral. Universiti Malaysia Sabah. (Unpublished)

[img]
Preview
Text
ae0000001116.pdf

Download (2MB) | Preview

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
Uncontrolled Keywords: disc-shaped triphenylene, alkyl, synthesis, thermogram, crystal
Subjects: Q Science > QD Chemistry
Divisions: SCHOOL > School of Science and Technology
Depositing User: MDM SITI AZIZAH IDRIS
Date Deposited: 13 Jun 2013 04:51
Last Modified: 16 Oct 2017 06:54
URI: http://eprints.ums.edu.my/id/eprint/6264

Actions (login required)

View Item View Item