ON THE TRANSITIONAL PROPERTIES OF RIGID OLIGOMERS - THE ORIENTATIONAL ORDER OF THE MONOMER 4-N-PENTYL-4'-CYANOBIPHENYL AND ITS PLATINUM DICHLORIDE LINKED DIMER

D W  BRUCE; S M  FAN; G R  LUCKHURST

ON THE TRANSITIONAL PROPERTIES OF RIGID OLIGOMERS - THE ORIENTATIONAL ORDER OF THE MONOMER 4-N-PENTYL-4'-CYANOBIPHENYL AND ITS PLATINUM DICHLORIDE LINKED DIMER

D W BRUCE, S M FAN, G R LUCKHURST

Chemistry

Research output: Contribution to journal › Comment/debate › peer-review

Abstract

We have studied the orientational order of the monomer 4-n-pentyl-4'-cyanobiphenyl (5CB) and of the dimer, [PtCl2(5CB)2], formed by linking two cyanobiphenyl units via a platinum dichloride bridge, dissolved in a common nematic solvent, using deuterium NMR spectroscopy. Analysis of the second rank order parameters, obtained from these experiments, in terms of a molecular field theory yields the anisotropic solute-solvent strength parameter responsible for the solute alignment. In the limit of low solvent order the strength parameters for the monomer and dimer differ significantly, in accord with the differing anisotropies of these two solutes. However, as the solvent order increases, so the relative difference in the strength parameters decreases, tending to zero. A possible explanation for this intriguing behaviour is proposed.

Original language	English
Pages (from-to)	1093-1099
Number of pages	7
Journal	LIQUID CRYSTALS
Volume	16
Issue number	6
Publication status	Published - Jun 1994

Keywords

UNIAXIAL LIQUID-CRYSTALS
COMPUTER-SIMULATION
ANISOTROPIC SYSTEMS
COMPLEXES

Cite this

@article{8ae2a79a02884e46abb3c5bca9e692b5,

title = "ON THE TRANSITIONAL PROPERTIES OF RIGID OLIGOMERS - THE ORIENTATIONAL ORDER OF THE MONOMER 4-N-PENTYL-4'-CYANOBIPHENYL AND ITS PLATINUM DICHLORIDE LINKED DIMER",

abstract = "We have studied the orientational order of the monomer 4-n-pentyl-4'-cyanobiphenyl (5CB) and of the dimer, [PtCl2(5CB)2], formed by linking two cyanobiphenyl units via a platinum dichloride bridge, dissolved in a common nematic solvent, using deuterium NMR spectroscopy. Analysis of the second rank order parameters, obtained from these experiments, in terms of a molecular field theory yields the anisotropic solute-solvent strength parameter responsible for the solute alignment. In the limit of low solvent order the strength parameters for the monomer and dimer differ significantly, in accord with the differing anisotropies of these two solutes. However, as the solvent order increases, so the relative difference in the strength parameters decreases, tending to zero. A possible explanation for this intriguing behaviour is proposed.",

keywords = "UNIAXIAL LIQUID-CRYSTALS, COMPUTER-SIMULATION, ANISOTROPIC SYSTEMS, COMPLEXES",

author = "BRUCE, {D W} and FAN, {S M} and LUCKHURST, {G R}",

year = "1994",

month = jun,

language = "English",

volume = "16",

pages = "1093--1099",

journal = "LIQUID CRYSTALS",

issn = "0267-8292",

publisher = "Taylor & Francis",

number = "6",

}

TY - JOUR

T1 - ON THE TRANSITIONAL PROPERTIES OF RIGID OLIGOMERS - THE ORIENTATIONAL ORDER OF THE MONOMER 4-N-PENTYL-4'-CYANOBIPHENYL AND ITS PLATINUM DICHLORIDE LINKED DIMER

AU - BRUCE, D W

AU - FAN, S M

AU - LUCKHURST, G R

PY - 1994/6

Y1 - 1994/6

N2 - We have studied the orientational order of the monomer 4-n-pentyl-4'-cyanobiphenyl (5CB) and of the dimer, [PtCl2(5CB)2], formed by linking two cyanobiphenyl units via a platinum dichloride bridge, dissolved in a common nematic solvent, using deuterium NMR spectroscopy. Analysis of the second rank order parameters, obtained from these experiments, in terms of a molecular field theory yields the anisotropic solute-solvent strength parameter responsible for the solute alignment. In the limit of low solvent order the strength parameters for the monomer and dimer differ significantly, in accord with the differing anisotropies of these two solutes. However, as the solvent order increases, so the relative difference in the strength parameters decreases, tending to zero. A possible explanation for this intriguing behaviour is proposed.

AB - We have studied the orientational order of the monomer 4-n-pentyl-4'-cyanobiphenyl (5CB) and of the dimer, [PtCl2(5CB)2], formed by linking two cyanobiphenyl units via a platinum dichloride bridge, dissolved in a common nematic solvent, using deuterium NMR spectroscopy. Analysis of the second rank order parameters, obtained from these experiments, in terms of a molecular field theory yields the anisotropic solute-solvent strength parameter responsible for the solute alignment. In the limit of low solvent order the strength parameters for the monomer and dimer differ significantly, in accord with the differing anisotropies of these two solutes. However, as the solvent order increases, so the relative difference in the strength parameters decreases, tending to zero. A possible explanation for this intriguing behaviour is proposed.

KW - UNIAXIAL LIQUID-CRYSTALS

KW - COMPUTER-SIMULATION

KW - ANISOTROPIC SYSTEMS

KW - COMPLEXES

M3 - Comment/debate

SN - 0267-8292

VL - 16

SP - 1093

EP - 1099

JO - LIQUID CRYSTALS

JF - LIQUID CRYSTALS

IS - 6

ER -