The synthesis and properties of fluoro-substituted analogues of 4-butyl-4′-[(4-butylphenyl)ethynyl]biphenyls

Abstract

The synthesis of 4-butyl-4′-[(4-butyl-2,6-difluorophenyl)ethynyl]biphenyl and its higher fluorinated analogues is presented and discussed. Correlations between molecular structure and mesomorphic properties for presented compounds as well as other known from the literature analogues have been drawn. The dielectric study of four synthesised compounds and their mixtures are presented and discussed. Trifluoro-substituted analogues are trade off between low dielectric anisotropy of difluorinated compounds and lower clearing points of tetrafluorinated ones.

Keywords:

• high birefringent nematic
• phenyltolane
• fluorinated LC
• positive dielectric anisotropy nematic
• 4-(phenylethynyl)biphenyl

Acknowledgements

This work is supported by the Key Project POIG.01.03.01-14-016/08 ‘New Photonic Materials and their Advanced Applications’ and Military University of Technology Grant 08–983.