121669-85-0Relevant articles and documents
Novel chiral fluoro-substituted benzoyloxybenzoates exhibiting an antiferroelectric mesophase
Shubashree,Sadashiva,Dhara, Surajit
, p. 21 - 32 (2007/10/03)
The synthesis and properties of a new series of chiral fluoro-substituted benzoyloxybenzoates with nonchiral chains ranging from heptyloxy to octadecyloxy are reported. The mesomorphic properties of all of the compounds have been examined by a combination of optical polarized light microscopy, differential scanning calorimetry, and miscibility studies. They show rich polymorphism, and seven compounds exhibit the antiferroelectric (SmC*A) phase. The spontaneous polarization in the ferroelectric (SmC*) phase has been measured as a function of temperature for selected compounds.
The synthesis and mesomorphic properties of some novel antiferroelectric liquid crystals
Hird, Michael,Goodby, John W.,Toyne, Kenneth J.,Gleeson, Helen F.,Peter Buxton,Seed, Alexander J.,Herbert, Mark R.
, p. 213 - 220 (2007/10/03)
Several esters have been synthesised that exhibit the antiferroelectric smectic C phase. The core structures, like virtually all antiferroelectric materials, are very similar to that of MHPOBC. Lateral fluoro substituents have been used to reduce melting points and to investigate their effect on mesomorphic properties, spontaneous polarisation and tilt angle. A new device format reported by Lagerwall requires antiferroelectric liquid crystals with a 45° tilt angle. Novel antiferroelectric materials were prepared with fluoro substituents in lateral positions and in a terminal chain to provide low melting points, high antiferroelectric phase stability, high spontaneous polarisation and tilt angles of up to 45°. The synthetic routes to the novel materials are discussed, and the transition temperatures, tilt angles and spontaneous polarisations are compared to those of known materials.
