X-ray and Miscibility Investigations on New Compounds Exhibiting Wide Range Smectic Q Phases

Novel chiral liquid crystal with two chiral butyl lactate chains exhibiting several frustrated mesophases including smectic Q and TGB phases separated by an optically isotropic phase

“…Another frustrated mesophase, the smectic Q phase (SmQ), 12,13 has been described as a crystal of twist grain boundaries. 14 It was found to be an intermediate step between the antiferroelectric smectic SmC A ( firstly labelled SmO) and the isotropic liquid.…”

Novel non-symmetric chiral twin liquid crystals possessing two identical chiral moieties at both peripheral ends: highly chirality-sensitive phases appeared between smectic and isotropic liquid phases

“…10 Location of the chiral moieties in the overall molecular structure seems to have a significant effect on the appearance of these chirality-induced frustrated superstructures. For example, compounds showing the SmQ phase possess an identical chiral moiety at both sides of the rigid core, 7,8,11,12 and the dichiral mesogen showing a chirality-induced cubic phase also possesses two chiral moieties with different structures at both peripheral ends of the rigid core part. 9 Recently, the introduction of chiral moieties at both ends of the central aromatic core of a molecular twin has been reported to have an important effect on the stabilization of the ferrielectric structure.…”

Remarkable effect of a lateral substituent on the molecular ordering of chiral liquid crystal phases: A novel bromo-containing dichiralcompound showing SmC* variants

“…It is interesting to consider why the introduction of a substituted group into the core part results in such a drastic change in the phase sequence. Both the SmQ phase 21 and the ferrielectricphase 2,14,22 have been reported to be extremely sensitive to the degree of chirality, thus as a first step of the investigation, molecular chirality was evaluated and compared between compounds 1 and 2. As a measurement of the degree of chirality, the CD and HTP studies were performed.…”