SCHEDULED MAINTENANCE:
On addition of optically-active ammonium ions the helical pitch of cholesteric liquid crystals containing steroidal crown ethers changes in an enantioselective manner: in certain cases the difference in the colour change can be visually detected.
T. Nishi, A. Ikeda, T. Matsuda and S. Shinkai, J. Chem. Soc., Chem. Commun., 1991, 339 DOI: 10.1039/C39910000339
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