79130-11-3Relevant academic research and scientific papers
Mesomorphism behavior of two series of chiral compounds with semiperfluorocarbon chains
Li, Jie,Zhao, Nan,Li, Yi,Li, Baozong,Yang, Yonggang
scheme or table, p. 123 - 132 (2012/10/07)
Thermotropic liquid crystals with fluorocarbon chains have attracted much attention, because they are feasible to form smectic phases. Herein, two series of chiral compounds with semiperfluorocarbon chains were designed and synthesized. These compounds were characterized by IR, 1H NMR, 19F NMR, mass spectroscopy, and elemental analysis. Phase transition behavior was investigated by differential scanning calorimetry and polarized optical microscopy. Members of the two-ring series do not exhibit liquid crystalline phases. However, the three-ring analogues exhibit an enantiotropic SmA phase. When the length of alkyl chains is sufficient, an enantiotropic SmB phase is also identified. Taylor and Francis Group, LLC.
Liquid crystalline properties of unsymmetrical bent-core compounds containing chiral moieties
Reddy, R. Amaranatha,Sadashiva,Baumeister
, p. 3303 - 3316 (2007/10/03)
The synthesis, characterization and mesomorphic properties of new unsymmetrical bent-core compounds containing chiral moieties are reported. These compounds have been derived from either 3-hydroxybenzoic acid or 2,7-dihydroxynaphthalene as the central unit. The chiral group is incorporated either within the bent-core structure as a linking group or is appended in the terminal position. The influence of the position of the chiral moiety on the mesomorphic properties has been investigated. The bent-core compounds containing a chiral group (octan-2-ol) in the terminal chain exhibit a direct transition from chiral calamitic phases such as SmC*, SmC*γ to a polar banana phase with a two-dimensional lattice (ColobP A*) on decreasing temperature. In order to prove this phase sequence, the corresponding compound with a racemic octan-2-ol group at the terminal chain has been synthesized. The preliminary observations and investigations are presented for comparison with the chiral compound. Possible explanations for this unusual phase sequence and the models for the Col obPA* (SmCsPA*) phase are also discussed on the basis of X-ray and electric field experiments. The Royal Society of Chemistry 2005.
