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Abstract
Four chiral compounds have been synthesized. Their phase transition behavior was investigated by differential scanning calorimetry and polarized optical microscopy. Two of them show monotropic smectic C* phases. Moreover, one of them shows an enantiotropic blue phase. The lateral fluoro-substitution strongly suppressed the formation of SmC* phases and decreased clearing points. Although the introduction of nitro group in the core decreased the length-diameter ratio, the temperature range of monotropic SmC* phase did not change much.
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ACKNOWLEDGMENT
This work was partially supported by Jiangsu Provincial Key Laboratory of Organic Chemistry Foundation and Natural Science Foundation of Jiansu Province (No. BK2007047).
Notes
Cr=crystal; Ch=cholesteric phase; SmC*=chiral smectic C phase; BP=Blue phase; I=isotropic liquid; Recr=recrystal.