Effect of Lateral Hydroxy/Alkoxy Group on Mesomorphism of Azobenzene Derivatives

Synthesis, spectroscopic studies and crystal structure of (E)-2-(2,4-dihydroxybenzylidene)thiosemicarbazone and (E)-2-[(1H-indol-3-yl)methylene]thiosemicarbazone

“…, k, l range À26 6 h 6 26 À9 6 h 6 9 À5 6 k 6 5 À14 6 k 6 14 À31 6 l 6 30 À17 6 l 6 17 [41,11]. The C@N bond which is accountable partially for the existence enol-imine form can also be inferred from the FT-IR spectra of compound 1.…”

Laterally Brominated Symmetric Liquid Crystal Trimers with (S)-(-)-2-Methylbutyl-4′-(4″-phenyl)benzoate Exhibiting N* and Blue Phases

“…As the continuation of our effort to further investigate the properties of the sevenring liquid crystal trimers mentioned above, we present another novel series of the homologous trimers incorporating two lateral bromine atoms in the benzylidene-1,4-phenylenediamine central mesogenic group. Previous studies have shown that the mesomorphic properties of laterally substituted liquid crystals are dependent on the type and size of the substituents as well as other factors such as polarizability and=or polarity [8,9]. Mesogens with relatively large lateral substituents such as the CH 3 or OCH 3 groups exhibit lower phase transition temperatures and lower-ordered mesophases as the result of reduced lateral intermolecular attraction [10,11].…”

Tautomeric properties and crystal structure of N-[2-hydroxy-1-naphthylidene]2,5-dichloroaniline

“…Recently, the liquid crystals researchers have also made a significant revelation that the introduction of lateral polar hydroxyl group will enhance the molecular polarizability as well as to stabilize the liquid crystalline compounds [11][12][13]. In this study, we synthesized Schiff base: N-[2-hydroxy-1-naphthylidene]2,5-dichloroaniline and investigated by using FT-IR, UV-VIS and X-ray crystallographic techniques in order to study the hydrogen bonding and tautomeric equilibrium in both the solution and solid states (Scheme 1).…”