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Several homologous series of biaromatic liquid crystals with structure type C n H 2n+1 O • C 6 H 4  • M•C 6 H 4 -CN are investigated. By studying the phase transition temperatures in binary mixed systems a "re-entrant" nematic phase N (re)  is established for all compounds exhibiting smectic A phases. The virtual transition temperatures N (re)  - S A  are found to decrease with increasing chain length of the alkyloxy group. The influence of the middle group M on the re-entrant behaviour can be attributed mainly to its dipole moment. The temperature range of the smectic A phase decreases when the middle group dipole moment is additive to that of the nitrile group. To summarize it can be said that the "re-entrant" behaviour of biaromatic liquid crystals is found to be very similar to that of triaromatic systems reported recently

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Nachweis der re-entrant nematischen Phase an verschiedenen homologen biaromatischen Flussigkristallen durch Untersuchung binarer Mischsysteme / Re-entrant Nematic Phase Established for Several Homologous Biaromatic Liquid Crystals by Investigation of Binary Mixed Systems