129820-08-2Relevant academic research and scientific papers
Formation and Properties of Ferroelectric Liquid Crystalline Compound Containing -C(O)-S-O-Linkage
Takatoh, Kohki,Sakamoto, Masanori
, p. 2720 - 2723 (2007/10/02)
During our investigations of the synthesis of ferroelectric liquid crystal compounds containing a fluorenone nucleus, the formation of a novel compound having a -C(O)-S-O-linkage was discovered as a by-product when a derivative of fluorenone carboxylic acid was treated with thionyl chloride and a phenol.This compound also exhibited ferroelectric liquid crystal properties.Compounds with a -C(O)-S-O-linkage have been little reported; this is the first report concerning a liquid crystalline compound with this type linkage.The thermal stability of the mesophase is reduced upon changing from the -C(O)-O-linkage to the -C(O)-S-O-linkage.The synthesis and properties of this compound are discussed in detail.
Liquid Crystalline Derivatives Containing Fluorene and Fluorenone Structures
Takatoh, K.,Sakamoto, M.
, p. 339 - 349 (2007/10/02)
The authors have synthesized liquid crystalline materials containing fluorene, fluorenone and biphenyl structures.Among these materials, comparison have been made for 1) Thermal stabilities for smectic A and smectic C* phases. 2) Tilt angles and spontaneous polarizations in the surface stabilized ferroelectric liquid crystal.These properties are markedly dependent on the structures of the central cores.In the fluorene derivatives, the tilt angles and the spontaneous polarizations were both smaller than those in the biphenyl derivatives.On the other hand, in the fluorenone derivatives, both larger tilt angles and greater spontaneous polarizations than for fluorene derivatives were observed.This increase is considered to be due to the induction force, which is introduced by the dipole moment perpendicular to the molecules of the fluorenone structure.Concerning the stability of smectic A phase and smectic C* phase for these derivatives, the authors confirmed the same result as the conclusion of the authors' previous work.
