title: Spectroscopy of PVK-phenyl derivatives disturbed the long-range ordering of liquid crystalline phase.
abstract: 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.
authors.affiliation: Vavilov State Optical Institute, 12 Birzhevaya Line, St. Petersburg, 199034 Russia.
authors.forename: N V
authors.initials: NV
authors.lastname: Kamanina
authors.forename: Yu M
authors.initials: YM
authors.lastname: Voronin
authors.forename: I V
authors.initials: IV
authors.lastname: Kityk
authors.forename: A
authors.initials: A
authors.lastname: Danel
authors.forename: E
authors.initials: E
authors.lastname: Gondek
mesh_terms: D001713:Biphenyl Compounds / Q000737:chemistry*; D050866:Liquid Crystals / Q000737:chemistry*; D013057:Spectrum Analysis; D055672:Static Electricity; D013997:Time Factors
chemical_list: D001713:Biphenyl Compounds