Novel asymmetrical single- and double-chiral liquid crystal diads with wide blue phase ranges

Abstract

Novel asymmetrical single- and double-chiral liquid crystal diads are reported, where diad III-D exhibited the widest range of BPI about 31 °C. Large biaxiality and dipole moment of the bent molecule are useful to extend the BP temperature range.

Hydrogen-bonded effects on supramolecular blue phase liquid crystal dimeric complexes

“…The hydrogen-bonded effects on supramolecular blue phase LCs of asymmetric H-bonded dimeric complexes D/P and D/P* are compared with their analogous covalent diads (see ref. 33), i.e., H-bonded dimeric complexes A*/P, A/P* and A*/P* vs. covalent diads A*-P, A-P* and A*-P*, respectively. 33…”

“…33), i.e., H-bonded dimeric complexes A*/P, A/P* and A*/P* vs. covalent diads A*-P, A-P* and A*-P*, respectively. 33…”

“…For the first time, the hydrogen-bonded effects on supramolecular blue phase LCs are compared with their analogous covalent diads. 33 In addition, the influences of the position of the chiral center (on H-donor and/or H-acceptor) and the lateral fluoro substituent on the BP temperature range were investigated systematically.…”

Recent synthetic advances in pyridine-based thermotropic mesogens

“…Wei et al 23 prepared a series of asymmetric hydrogen bonded complexes 57b-c,d-d*/47a-a** and also prepared complexes with different molar ratios of proton donors (57b-c,dd*) and proton acceptors (47a-a*). Further, they studied their mesomorphic properties and compared them with their analogous covalent diads reported by Wei et al 24 Scheme 7 shows the synthetic route for the preparation of the hydrogen bonded complexes. Hydrogen bond donors 57b-c,d-d* were synthesized by stirring 56b-c,d-d* and 10% Pd/C catalyst in THF solvent under hydrogen atmosphere at room temperature overnight.…”

The first blue phase reactive monomers containing a bi-mesogenic core and their side-chain polymers

“…20 Pivnenko et al have reported that dimeric materials could stabilize the blue phase and enlarge its temperature range ca. The diad structures of BPLCs have been reported by our group recently, 26 which are novel asymmetrical liquid crystal diads with a central chiral flexible linker to link two different mesogenic cores. 21 In the meanwhile, it is a very common idea and a helpful strategy to use polymeric structures to stabilize and extend the BP temperature ranges.…”