Journal
LIQUID CRYSTALS
Volume 44, Issue 4, Pages 695-704Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2016.1233584
Keywords
Solvatochromism probe; mixture liquid crystal; matrix anisotropy; Kamlet-Abboud-Taft polarity function
Funding
- Technology Innovation Industrial Program - Ministry of Trade, Industry & Energy (MI, Korea) [10052667]
- LG Display Co., Ltd.
- Korea Evaluation Institute of Industrial Technology (KEIT) [10052667] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The use of liquid crystals (LCs) as anisotropic solvents is desired for various potential applications and usually for other organic and inorganic compounds. In this work, solvent polarity parameters are obtained using a spectroscopic method for four LCs with a range of high and low dielectric anisotropy (epsilon). Solvatochromic polarity parameters for these LCs were defined via Kamlet-Abboud-Taft polarity functions characterizing different temperatures and phases, isotropic and anisotropic, and using the Reichardt's dye and 2,6-diphenyl-4-(2,4,6-triphenyl-1-pyridinio) phenolate standard probe. The investigated polarity parameters reveal the effects of LC media on the photo-physical behaviour of solute molecules in isotropic and anisotropic media. Subsequently, a new LC polarity parameter (Z(o)) is introduced as an overall matrix anisotropy polarity parameter to characterize variation between isotropic and anisotropic phases. The values of Z(o) are sorted from higher to lower dielectric anisotropies (epsilon). [GRAPHICS] .
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