Spectroscopy of PVK-phenyl derivatives disturbed the long-range ordering of liquid crystalline phase.
It has been shown that replacing of O-CH3 substituents in PVK-phenyl derivative chromophores by C-N groups leads to appearance of long-ranged dipole-dipole interactions in the composites including PVK-CN, fullerenes and cyano-biphenyl derivatives. Following quantum chemical calculations it has been demonstrated that interaction of the chromophores with the LC matrices favors dipole-dipole ordering, however it description requires to take into account non-homogenous space charge density distribution. During doping by PVK-CN derivatives phase transition has been found from uniaxial system with pure nematic to the quasi-smectic LC state with the substantially different parameter of ordering. Moreover it was established that during this substitution the switching times drastically jump from millisecond to microsecond regime.
Kamanina
N V
NV
Vavilov State Optical Institute, 12 Birzhevaya Line, St. Petersburg, 199034 Russia.
Voronin
Yu M
YM
Kityk
I V
IV
Danel
A
A
Gondek
E
E
D001713:Biphenyl Compounds / Q000737:chemistry*; D050866:Liquid Crystals / Q000737:chemistry*; D013057:Spectrum Analysis; D055672:Static Electricity; D013997:Time Factors
D001713:Biphenyl Compounds