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New chiral imines based on S-α-phenylethylamine and S-α-benzylethylamine in induced cholesteric and smectic mesophases: II. Behavior of chiral dopants in ester liquid-crystal systems

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Abstract

The temperature dependences of the pitch of induced helical structures in the ester liquid-crystal systems containing hydroxyphenyl benzoate derivatives and chiral N-aroyloxybenzylidene-S-α-phenylethylamines or N-aroyloxybenzylidene-S-α-benzylethylamines have been measured. The twisting power of chiral dopants is calculated and the temperature dependence of the helical pitch in the induced cholesteric (N *) and smectic C * mesophases is quantitatively characterized. The parameters A = dT is/dC that characterize the effect of dopants on the thermal stability of the N * phases are determined from the concentration dependences of the cholesteric-isotropic transition temperature T ts for the n-hexyloxyphenyl-n-butylbenzoate-chiral dopant systems. The results obtained are compared with the data for the 4-n-pentyl-4′-cyanobiphenyl (5CB)-based cholesteric systems induced by the chiral dopants under consideration.

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Authors and Affiliations

  1. Institute of Single Crystals, National Academy of Sciences of Ukraine, pr. Lenina 60, Kharkov, 310141, Ukraine

    G. P. Semenkova, L. A. Kutulya & N. I. Shkol’nikova

  2. Kharkov State University, pl. Svobody 4, Kharkov, 310077, Ukraine

    T. V. Khandrimailova

Authors
  1. G. P. Semenkova
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  2. L. A. Kutulya
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  3. N. I. Shkol’nikova
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  4. T. V. Khandrimailova
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__________

Translated from Kristallografiya, Vol. 46, No. 1, 2001, pp. 128–135.

Original Russian Text Copyright © 2001 by Semenkova, Kutulya, Shkol’nikova, Khandrima\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \)lova.

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Semenkova, G.P., Kutulya, L.A., Shkol’nikova, N.I. et al. New chiral imines based on S-α-phenylethylamine and S-α-benzylethylamine in induced cholesteric and smectic mesophases: II. Behavior of chiral dopants in ester liquid-crystal systems. Crystallogr. Rep. 46, 118–125 (2001). https://doi.org/10.1134/1.1343139

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  • DOI: https://doi.org/10.1134/1.1343139

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