Optically active mesogenic dispiro[2.0.2.1]heptane derivatives and their unusual physical properties

Physical properties. i.e. phase transition temperatures, response times, Ps values, tilt angles. helical twisting powers and helical twisting senses o f a series of novel ferroelectric liquid crystalline compounds with non-sub stituted and halogen-substituted dispiro[2.0.2.1]heptyl moieties in their s ide chains have been measured, When mixed with an achiral SmC base mixture, the resulting SmC* mixtures containing the novel compounds showed ferroele ctricity, and the novel compounds were estimated as useful dopants for ferr oelectric liquid crystal mixtures. Further unusual properties were observed with the combinations of the two diastereomeric novel compounds, for examp le (1S,3R,4S)-4a and (1S,3R,4R)-5a. They showed opposite signs for the Ps a nd the same sense for the N* helical twisting, which clearly suggests that the direction of the Ps and helical sense of N* must be derived from differ ent origins.