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Mesomorphic properties of new cholesteryl derivatives
1 , 1 , * 2
1  School of Chemical Sciences, Universiti Sains Malaysia, MALAYSIA
2  Faculty of Science, Universiti Tunku Abdul Rahman, MALAYSIA

Abstract: A homologous series of cholesteryl 4'-alkyloxybiphenyl-4-carboxylates (CnH2n+1OC6H4 C6H4COOCh, where Ch = cholesteryl) possessing different length of alkyl chain (n = 6, 8, 10, 12, 14, 16, 18) were synthesized. Phase transition temperatures and thermal parameters were obtained from differential scanning calorimetry. Observation under optical polarizing microscope revealed all the members of the series possessing SmA property. Additional mesophase was observed for lower members whereby the C6-14 derivatives displayed fan-shaped and oily streaks textures of cholesteric phase. The influence of structural changes on the mesomorphic properties is discussed.