Solvatochromic solvent polarity parameters for the characterisation of some cyanobiphenyl nematic liquid crystals

In application of liquid crystals (LCs) as solvents, it is required to obtain the polarity and solvatochromic polarity parameters such as the Kamlet-Abboud-Taft polarity functions. In this study, solvatochromic polarity parameters of some cyanobiphenyl nematic liquid crystals were acquired in differ...

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Bibliographic Details
Published in:Liquid crystals 2013-09, Vol.40 (9), p.1195-1201
Main Authors: Zakerhamidi, M. S., Shahrabi, Sh
Format: Article
Language:English
Subjects:
Absorption spectra
Anisotropy
cyanobiphenyl liquid crystal
Dyes
Kamlet-Abboud-Taft polarity function
Liquid crystal polymers
Liquid crystals
Matrix
matrix anisotropy
Nematic
Phases
Polarity
solvatochromism probe
Solvents
Temperature effects
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Summary:In application of liquid crystals (LCs) as solvents, it is required to obtain the polarity and solvatochromic polarity parameters such as the Kamlet-Abboud-Taft polarity functions. In this study, solvatochromic polarity parameters of some cyanobiphenyl nematic liquid crystals were acquired in different temperatures and phases, isotropic and anisotropic phases, using the Reichardt's dye and 2,6-diphenyl-4-(2,4,6-triphenyl-1-pyridinio)phenolate standard probe. In addition, to decrease the overlapping of the absorption band of probe with the absorption bands of LCs and to increase the solubility of the probe in LCs, a new azo dye was used as a probe for obtaining some solvatochromic polarity parameters. Finally, a new polarity parameter, the LC anisotropic matrix, is introduced.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678292.2013.807940