2003/07/30 by Keiki Kishikawa, Naoki Muramatsu, Shigeo Kohmoto +2
Materials Science · Biochemistry, Genetics and Molecular Biology · Chemistry · #Liquid Crystal Research Advancements #Plant Reproductive Biology #Molecular spectroscopy and chirality
paper · doi:10.1021/cm0340476
Compounds 1 − 3, each possessing a long bent-rod shape and a central large dipole, were designed and synthesized as dopants which transform liquid-crystal smectic C phases to smectic C A phases. The properties and the layer structures of the dopant molecules in the mesophases were investigated by polarized light microscopy, differential scanning calorimetry (DSC), and X-ray diffraction (XRD). Induction of smectic C A phases from the smectic C phases of compounds 4 − 7 was performed by doping with a small amount of dopants 1 − 3 . In particular, even 1 wt % (0.5 mol %) of 3c was enough to convert the Sm- C phase into the Sm- C A phase in the case of 4 . In addition, matching in the core-lengths was important for the induction. Further, importance of the central dipole was also confirmed by replacement of the CF 3 groups of compound 1 with CH 3 or H.