On the Miscibility of Nematic Liquid Crystals with Ionic Liquids and Joint Reaction for High Helical Twisting Power Product(s)

Abstract

Mixtures of nematic liquid crystals (LCs) with chiral ionic liquids (CILs) may find application as active materials for electrically driven broadband mirrors. Five nematic liquid crystal hosts were mixed with twenty three ionic liquids, including chiral ones, and studied in terms of their miscibility within the nematic phase. Phase diagrams of the mixtures with CILs which exhibited twisted nematic phase were determined. Miscibility, at levels between 2 and 5 wt%, was found in six mixtures with cyanobiphenyl-based liquid crystal host—E7. On the other hand, the highest changes in the isotropization temperature was found in the mixtures with isothiocyanate-based liquid crystal host—1825. Occurrence of chemical reactions was found. A novel chiral binaphtyl-based organic salt [N11116][BNDP] was synthesized and, in reaction to the 1825 host, resulted in high helical twisting power product(s). Selectivity of the reaction with the isothiocyanate-based liquid crystal was found.

Unveiling Discotic Liquid Crystalline Phase Changes through Supramolecular Disc Polymorphism at Their Disc-Driven Gel State

“…Herein, one PAD salt, namely, pentadecyl ammonium adipate (PAA), is taken out from the previous PAD salt-based combinatorial library for additional mesogenic study (Figure a). In ionic systems, similar to PAD salts, some long-chain-based organic salts and zwitterions exhibiting flattened or rod-like structure are known to exhibit discotic or calamitic liquid crystalline properties, respectively, due to their molecular shapes. − …”