Abstract
Three chiral compounds (n=10, 11, 12) belonging to the optically active series: 3-fluoro-4-[(R) ou (S)-1-methyl- fluoro-4-[(R) or (S)-1-methylheptyloxy]-4'-(4''-alkoxy-2'', 3''-difluorobenzoyloxy) tolans (nF 2 BTFO 1 M 7 ) have been synthesized. The helical S A * phase or TGB A phase is found in the decyloxy derivative. The most interesting compound is obtained with n=11. It displays, for the first time, two TGB phases (TGB A and TGB C phases). The nature of these helical smectic phases is confirmed by different studies: optical observation, DSC, contact method, mixtures, X-ray diffraction and helical pitch measurements. The electrooptical properties of the S C * phase have also been studied
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