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Laterally fluorinated liquid crystals containing the 2,29-bithiophene moiety

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Publication details

JournalLIQUID CRYSTALS
DatePublished - 2007
Issue number4
Volume34
Number of pages18
Pages (from-to)489-506
Original languageEnglish

Abstract

The synthesis and systematic evaluation of the influence of lateral mono-, di- and tetra-fluorination of the terminal phenyl ring on mesomorphic properties in seven novel series of suitably fluoro-substituted 5-n-alkyl-5 '-(4-n-decyloxyphenyl)-2,2 '-bithienyls is reported. Compared with their non-fluorinated parent counterparts, lateral fluorination eliminates high order smectic phases and reduces thermal stability, to reveal compounds exhibiting a selection of nematic, smectic A and smectic C phase types. As the number of fluoro-substituents increases from one to two, mesophase thermal stability drops drastically; the disposition of the second fluoro-substituent is important. Across-axis disposition is more detrimental than along-axis. However, complete fluorination does not destroy mesophase formation. Indeed, tetrafluorophenyl compounds are more stable than certain 3,5- and 2,6-difluoro compunds. The extrapolated birefringence for members of a series of 5-n-alkyl-59(2,3-difluoro-4-n-decyloxyphenyl)-2,2 '-bithienyls is approximately 0.21.

    Research areas

  • CROSS-COUPLING REACTIONS, BANANA-SHAPED MESOGENS, BENT-CORE COMPOUNDS, TRANSITION-TEMPERATURES, SPONTANEOUS POLARIZATION, MESOMORPHIC PROPERTIES, ORGANIC ELECTROPHILES, OPTICAL ANISOTROPIES, FLUORO-SUBSTITUENTS, REFRACTIVE-INDEXES

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