The re‐entrant nematic phase of 4‐n‐octyloxybenzoyloxy‐benzylidene‐4′ — cyanoaniline

Induced Smectic and Nematic Phases and Re-entrant Phenomena

“…The compounds with flexible spacer group: -CH(CH 3 )-CH 2 -COO-and -0-(CH 2 ) 3 -COO-were lately described [123,124]. The evidence was obtained that the reentrancy is not only possible in strong polar systems but also in low polar systems containing calamitic [125] or discotic molecules [126,127] and in mixed systems containing compounds of high and low polarity [46,62,128,129]. The systems including chiral compounds [130,131] and low and high molecular weight [132] compounds are also described.…”

From the discovery of the partially bilayer smectic A phase to blue phases in polar liquid crystals

“…French scientists in the late 1970s and early 1980s [59][60][61][62][63][70][71][72][73][74][75][76][77][78][79][80][81][82] (and soon others [83][84][85][86]) synthesised many families of three-ring compounds terminated with polar CN or NO 2 groups and with different bridge groups (COO, N = N, CH = CH, CH = N, CH 2 -CH 2 ) between the aromatic rings. A very rich polymorphism of SmA phases as well as the presence of enantiotropic N re below SmA d phase is observed.…”