We report here that a novel dichiral liquid crystal on cooling exhibits a new optically isotropic phase along with an endothermic transition enthalpy. This anomalous phenomenon was found to occur in 2-[4-[(R)-2-fluorohexyloxy]phenyl]-5-[4-[(S)-2-fluoro-2-methyldecanoyloxy]phenyl]pyrimidine (RSFPPY). In contrast, the diastereomer of RSFPPY, 2-[4-[(S)-2-fluorohexyloxy]phenyl]-5-[4-[(S)-2-fluoro-2-methyldecanoyloxy]phenyl]pyrimidine (SSFPPY) did not show the unusual transition. The effect of chirality on the transition behavior is discussed.
