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Boeffel C, Hisgen B, Pschorn U, Ringsdorf H, Spiess HW. Structure and Dynamics of Liquid Crystalline Polymers from Deuteron NMR. Isr J Chem 2013. [DOI: 10.1002/ijch.198300055] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Emsley J, Luckhurst G. The effect of internal motion on the orientational order parameters for liquid crystalline systems. Mol Phys 2006. [DOI: 10.1080/00268978000102541] [Citation(s) in RCA: 116] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Emsley J, Luckhurst G, Stockley C. The deuterium and proton-{deuterium} N.M.R. spectra of the partially deuteriated nematic liquid crystal 4-n-pentyl-4′-cyanobiphenyl. Mol Phys 2006. [DOI: 10.1080/00268978100102651] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Avent A, Emsley J, Luckhurst G. The orientational ordering of a liquid crystal determined using fluorine spin echo spectroscopy. Mol Phys 2006. [DOI: 10.1080/00268978300101511] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Boden N, Clark L, Clarke C, Kahol P. N.M.R. solid echoes in systems of coupled pairs of spins-1/2. Mol Phys 2006. [DOI: 10.1080/00268978300102621] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Boden N, Clark L, Bushby R, Emsley J, Luckhurst G, Stockley C. A deuterium N.M.R. study of chain ordering in the liquid crystals 4,4′-di-n-heptyloxyazoxybenzene and 4-n-octyl-4′-cyanobiphenyl. Mol Phys 2006. [DOI: 10.1080/00268978100100471] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- N. Boden
- a Department of Chemistry , The University , Leeds , LS2 9JT , England
| | - L.D. Clark
- a Department of Chemistry , The University , Leeds , LS2 9JT , England
| | - R.J. Bushby
- a Department of Chemistry , The University , Leeds , LS2 9JT , England
| | - J.W. Emsley
- b Department of Chemistry , The University , Southampton , SO9 5NH , England
| | - G.R. Luckhurst
- b Department of Chemistry , The University , Southampton , SO9 5NH , England
| | - C.P. Stockley
- b Department of Chemistry , The University , Southampton , SO9 5NH , England
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A theory of orientational ordering in uniaxial liquid crystals composed of molecules with alkyl chains. ACTA ACUST UNITED AC 1997. [DOI: 10.1098/rspa.1982.0061] [Citation(s) in RCA: 268] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The constituent molecules of thermotropic liquid crystals invariably contain an aromatic core to which is attached one and often two
n
-alkyl chains. Nuclear magnetic resonance investigations have revealed that the chain does not exist entirely in an all-
trans
configuration and that the orientational order of the methylene groups varies markedly along the chain. In this paper we develop a theory to explain these variations for a uniaxial phase at a given temperature and pressure. Our theory contains two distinct parts: one is a model for the conformational distribution of the alkyl chains while the other is for the potential of mean torque experienced by a conformer and which is responsible for its alignment with respect to the director. We use the rotameric state model developed by Flory to describe the conformations adopted by the alkyl chain. The potential of mean torque presents a more difficult problem and we assume that it may be represented by a sum of contributions from each rigid group in the molecule. The order parameters for the methylene and methyl groups in the alkyl chains of the 4-
n
-pentyl and 4-
n
-octyl-4'-cyanobiphenyls predicted by the theory are found to be in good accord with those obtained experimentally. We have also used the theory to predict the conformational distributions for both the isotropic and nematic phases of these mesogens; the calculated distributions are contrasted with those assumed by other models. In addition we have obtained the ordering matrices for the various conformers adopted by the two 4-
n
-alkyl-4'-cyanobiphenyls. The results of these calculations do not support the notion that the orientational order of such molecules can be described by a single, cylindrically symmetric ordering matrix.
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Hamley IW, Garnett S, Luckhurst GR, Roskilly SJ, Sedon JM, Pedersen JS, Richardson RM. Orientational ordering in the nematic phase of a thermotropic liquid crystal: A small angle neutron scattering study. J Chem Phys 1996. [DOI: 10.1063/1.471759] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Date R, Hamley I, Luckhurst G, Seddon J, Richardson R. Orientational ordering in liquid crystals: isotope labelling neutron diffraction experiments. Mol Phys 1992. [DOI: 10.1080/00268979200101781] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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11
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Volino F, Galland D, Ferreiras J, Dianoux A. Contribution to the study of the structure of a complex non rigid molecule in the liquid phase : Case of nematic para-azoxyanisole. J Mol Liq 1989. [DOI: 10.1016/0167-7322(89)80016-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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12
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Limmer S. Physical Principles Underlying the Experimental Methods for Studying the Orientational Order of Liquid Crystals. ACTA ACUST UNITED AC 1989. [DOI: 10.1002/prop.2190371202] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Toriumi H, Furuya H, Abe A. Deuterium NMR Studies on the Orientational Order in Dimeric Thermotropic Liquid Crystals. Polym J 1985. [DOI: 10.1295/polymj.17.895] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Lang EW, Lüdemann H, Piculell L. Nuclear magnetic relaxation rate dispersion in supercooled heavy water under high pressure. J Chem Phys 1984. [DOI: 10.1063/1.448164] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Vaz NAP, Doane JW. Temperature dependence of the Maier–Saupe order matrix from 2H–NMR of fluorene‐d10 in the nematic, smectic A, B, and C phases. J Chem Phys 1983. [DOI: 10.1063/1.446056] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Demus D, Diele S, Grande S, Sackmann H. Polymorphism in Thermotropic Liquid Crystals. ADVANCES IN LIQUID CRYSTALS 1983. [DOI: 10.1016/b978-0-12-025006-6.50007-3] [Citation(s) in RCA: 59] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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17
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Samulski ET, Dong RY. Chain ordering and molecular orientational order in liquid crystals. J Chem Phys 1982. [DOI: 10.1063/1.443683] [Citation(s) in RCA: 83] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Boden N, Clark L, Kahol P. NMR “solid” echoes in nematic 4-cyano-4′-n-penyl-d11-2′,3′,5′,6′-d4-biphenyl. Chem Phys Lett 1982. [DOI: 10.1016/0009-2614(82)85063-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Intramolecular reorientations and the effects of thermal history and hydrogen bonding in four closely related organic molecular solids. Chem Phys 1981. [DOI: 10.1016/0301-0104(81)87010-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Ban B. Nuclear magnetic relaxation resulting from the axial oscillation as internal motion coupled to the anisotropic rotational diffusion as overall motion. ACTA ACUST UNITED AC 1981. [DOI: 10.1016/0022-2364(81)90106-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Emsley J, Turner DL. Assignment of quadrupolar splittings in the deuterium nmr spectrum of 4,4'-dimethoxyazoxybenzene-d14 in the nematic phase by a 2d auto-correlation experiment. Chem Phys Lett 1981. [DOI: 10.1016/0009-2614(81)85417-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Barbarin F, Chausse J, Fabre C, Germain J. Etude par R.P.E. des structures et de la dynamique moléculaire dans le B.O.B.O.A. ACTA ACUST UNITED AC 1981. [DOI: 10.1051/jphys:019810042080118300] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Dong RY, Lewis J, Tomchuk E, Wade CG, Bock E. Deuterium NMR study of molecular order and conformation in the nematic phase of p‐azoxyanisole. J Chem Phys 1981. [DOI: 10.1063/1.440820] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Burnell E, De Lange C. On the average orientation of molecules undergoing large-amplitude conformational changes in anisotropic liquids. Chem Phys Lett 1980. [DOI: 10.1016/0009-2614(80)87018-7] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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