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- W2006985367 abstract "Abstract 4-n-Alkyl-4′-cyanobiphenyls (1) have achieved widespread application as stable thermotropic liquid crystals with mesophases at room temperature. The importance of the cyano functional group in the liquid-crystalline behaviour of these compounds is not clearly defined. By modifying this functional group with minimal changes in molecular geometry, we have found two new classes of mesomorphs. 4-n-Alkyl-4′-isocyanobiphenyls (2) and 4-n-alkyl-4′-(haloalkynyl)biphenyls (3). The synthesis of these compounds is described. Compound 2a (R = n-butyl) is non-mesomorphic, whereas compound 2b (R = n-pentyl) is a virtual liquid crystal melting at 34-5°C and supercooling to a nematic phase at 30°C, and 2c (R = n-hexyl) is a nematic liquid crystal from 9 to 19°C. Compounds of structure 3 (R = n-. pentyl, X = Si(CH3)3. H, CH3, Cl) are not liquid crystals. The corresponding bromo- and iodoalkynes (3, R = n-pentyl, S = Br, 1) are liquid crystals with mesomorphic ranges of 88-108°C and 110-119°C. respectively." @default.
- W2006985367 created "2016-06-24" @default.
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- W2006985367 date "1991-04-01" @default.
- W2006985367 modified "2023-09-29" @default.
- W2006985367 title "Synthesis of Isocyano and (Haloalkynyl)Biphenyls: New Thermotropic Liquid Crystals" @default.
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- W2006985367 doi "https://doi.org/10.1080/00268949108033417" @default.
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