Yonggang Yang, Haitao Li, Jianxun Wen 

 Mol. Cryst. Liq. Cryst., 2007, 469, 23-29.

         Two series of compounds with semifluorinated chains have been synthesized. These compounds were characterized by IR, 1H NMR, 19F NMR, MS, and elemental analysis. Their phase-transition behavior was investigated by differential scanning calorimetry and polarizing optical microscopy. Both the introduction of a triple bond and the decrease of the polarity of the core act to decrease the clearing points and suppress the formation of smectic C phase.