Mixtures of nematic 4-cyano-4′-pentylbiphenyl and (R)-2,2′-dihydroxy-1,1′-binaphthyl-condensed fulgide derivatives form stable cholesteric liquid crystalline states. Photochromic reactions of them induced the change of their cholesteric pitch reversibly.
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Yokoyama et al. (1997) studied this question.
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