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 (Δε). 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 (Zo) is introduced as an overall matrix anisotropy polarity parameter to
characterize variation between isotropic and anisotropic phases. The values of Zo are sorted from
higher to lower dielectric anisotropies (Δε).
کلید واژگان :
Solvatochromism probe; mixture liquid crystal; matrix anisotropy; Kamlet–Abboud–Taft polarity function
