| Autor: |
Babak, Nikolay, Shishkin, Oleg, Shishkina, Svitlana, Gella, Ivan, Musatov, Vladimir, Novikova, Nataliya, Lipson, Victoria |
| Předmět: |
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| Zdroj: |
Structural Chemistry; Feb2016, Vol. 27 Issue 1, p295-303, 9p |
| Abstrakt: |
New series of chiral dopants for cholesteric liquid-crystal compositions were synthesized on the base of 2-substituted allobetuline derivatives, and their steric structure was determined by X-ray analysis. The relationship between spatial structure of these compounds and their ability to induce cholesteric helix in 4-pentyl-4′-cyanobiphenyl nematic solvent was examined. The highest values of the helical twisting power | β| (71.38 ± 3.4) and (84.25 ± 3.7) mkm mol·pats showed ( E)-2-(4-chlorophenylmethylidene)-allobetuline and (2 R,3 R)-3-(4′-chlorophenyl)-2,2′-spiro-oxyranoallobetuline correspondingly. How the value of | β| in this series of compounds varies depending on the spatial arrangement relative to the aryl moiety of the chiral core is shown. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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