Refractive indices and order parameters of some tolane-based nematic liquid crystals

Four tolane-based liquid crystals, 4′-pentyl-, 4′-hexyl-, and 4′-heptyl-3-fluoro-4-isothiocyanatotolane and 4′-hexyloxy-3′-fluoro-4-isothiocyanatotolane have been investigated throughout the nematic and isotropic phase in order to determine their refractive indices and order parameters using the Vuk...

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Bibliographic Details
Published in:Journal of molecular liquids 2010-11, Vol.157 (2), p.119-124
Main Authors: Zakerhamidi, M.S., Ebrahimi, Z., Tajalli, H., Ghanadzadeh, A., Moghadam, M., Ranjkesh, A.
Format: Article
Language:English
Subjects:
Isothiocyanatotolanes
Order parameter
Refractive indices
Tolane-based liquid crystals
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Summary:Four tolane-based liquid crystals, 4′-pentyl-, 4′-hexyl-, and 4′-heptyl-3-fluoro-4-isothiocyanatotolane and 4′-hexyloxy-3′-fluoro-4-isothiocyanatotolane have been investigated throughout the nematic and isotropic phase in order to determine their refractive indices and order parameters using the Vuks method. These factors characterize anisotropic behaviors of selected liquid crystals that are essential for their applications and improvement. The temperature dependence of refractive indices, birefringence and order parameters in anisotropic nematic phase, have been investigated for these four nematic liquid crystals. All the compounds have positive and large optical anisotropies that increase with decreasing temperature.
ISSN:0167-7322
1873-3166
DOI:10.1016/j.molliq.2010.08.015