International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2533

Full Length Research Paper

Synthesis and smectogenic A and C*properties of (S)-(-)-2-Methylbutyl 4’-(4”-n-alkanoyloxybenzoyloxy)biphenyl-4-carboxylates

Sie-Tiong Ha1*, Guan-Yeow Yeap2 and Peng-Lim Boey2
1Department of Chemical Science, Faculty of Science, Universiti Tunku Abdul Rahman, Jln Universiti, Bandar Barat, Kampar, 31900 Perak, Malaysia. 2Liquid Crystal Research Laboratory, School of Chemical Sciences, Universiti Sains Malaysia, 11800 Minden, Penang, Malaysia.
Email: [email protected], [email protected]

  •  Accepted: 01 February 2010
  •  Published: 31 March 2010

Abstract

A series of chiral ester (S)-(-)-2-methylbutyl 4’-(4”-n-alkanoyloxybenzoyloxy)biphenyl-4-carboxylates possessing different length of alkyl chain have been isolated and their molecular structures were proposed via physical measurement and spectroscopy techniques. Phase transition temperatures and thermal parameters were obtained from differential scanning calorimetry. Observation under polarizing optical microscope revealed all the members of the series exhibiting fan shaped and helical line textures which can be assigned to the SmA and tilted SmC* phases, respectively. The influence of structural changes (core structure and terminal chain) on the mesomorphic properties is discussed.

 

Key words: Chiral liquid crystals, smectic A, smectic C*, structure-property relationship.