Abstract
The practical application of liquid crystals (LCs) as anisotropic and ubiquitous solvents is undoubtedly lucrative. Therefore, defining solvent polarity parameters as demonstrating the effects of anisotropic LC media on the photo-physical behavior of solute molecules is increasingly sought to determine their suitability for specific areas. For this fundamental reason, a spectroscopic method was used via Kamlet–Abboud–Taft (KAT) polarity functions to determine the solvatochromic polarity (SP) parameters for different LCs regarding high and low dielectric anisotropy (Δε) at different temperatures and LC phases, both isotropic and anisotropic. According to empirical solvent polarity parameters, our LCs were categorized as a dipolar hydrogen bonding donor solvent. Moreover, typical and overall matrix anisotropy polarity parameters as variations of the SP parameter values between the isotropic and anisotropic phases were sorted according to Δε magnitude. Finally, we introduced the linear solvation energy relationships of empirical solvent scales with the KAT parameters sets for the first time in nematic LCs with the well-established correlations.
Highlights
The use of liquid crystals (LCs) as a solvent was rst introduced by Svedberg[1] in 1916
The ranges of the b values from 0.52 to 0.58 for our investigated LCs indicate a higher hydrogenbond acceptor (HBA) capacity, whereas their values are larger than a few ionic liquids containing a pyridinium cation in b ranges of 0.29–0.40.48 It is well-known a er the phase transition temperature (Tc), the long rang order (LRO) in the nematic phase convert to short-range order (SRO) in the isotropic phase.[11]
The solvent polarity parameters of unknown-molecularstructure LCs were determined by using spectroscopic measurements
Summary
Be merged into the LC phase without disturbing the LC order if the structures of the solute and solvent molecules are compatible. The solvent polarity is appropriately de ned by molecular-microscopic empirical solvent parameters, which is derived from sufficiently strong solvent-dependent model processes with individual solvent molecules.[14] for a deep understanding of solute–solvent interactions, selection of an adequate solventsensitive reference process, and subsequent derivation of the empirical polarity parameters from it are crucial and signi cantly better descriptors compared to single physical constants of the solvent such as dielectric constant, dipole moment, and refractive index Paper such as spectroscopic properties,[21,22] equilibrium constant,[23] kinetic rate constants of chemical reactions,[24] and multiparameter approaches.[25,26] Among these measuring techniques, the spectroscopic method is based on a well-known and measurable experiment with solvent sensitive standard probes that dates back to 1922; Hantzsch later termed this phenomenon solvatochromism.[27]. These considerations lead one to think positively about using LC media as suitable solvents in selective areas
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