Mesomorphic Behavior of 1,2-Phenylene Bis[4-(4-alkoxybenzylideneamino)benzoates

Phase Transitionsand recent advances in liquid-crystals research

“…Simply bending of molecules from rod-like shapes brings about new physics that cannot be imagined in calamitic LCs, particularly with regard to polarity and chirality: (1) in-layer polar order emerges because free rotation about the molecular long axis is prevented due to close packing of bent-shaped molecules and (2) a variety of chirality-related phenomena arise from achiral molecular systems. The new mesophases are interesting not only from the structural point of view, but also because of some unusual physical properties [75][76][77][78]. It has been found that a minor change in the molecular Phase Transitions 839 structure can lead to a drastic change of the phase behavior [79][80][81][82][83].…”

Molecular structure and chiral liquid crystalline phases

“…bis (4-methoxyphenylazophenyl) isophthalate exhibited a mesophase which was shown to be nematic between 164 and 213 C [24]. Similarly, 1,2-phenylene bis (4-ethoxyphenylazoxybenzoate) is reported [24] to exhibit a nematic phase between 184 and 218 C. It was Kuboshita et al [25] who recently investigated in detail the mesomorphic behaviour of compounds with non-linear molecular structure as shown below:…”

Recent NMR Studies of Thermotropic Liquid Crystals

“…Matsuzaki et al and Kuboshita et al have prepared molecules based on 1,2-phenylene and 2,3-naphthalene central cores with bent angles of approximately 60°showing only conventional N and Sm phases [280,281]. A molecule 2,3-naphthylene bis[2-fluoro-4-(4-dodecyloxybenzoyloxy)benzoate] (N(2,3)-F-O12) has recently been studied by 13 C NMR [282].…”