The structures and conformations of mesogenic molecules in the pre-transitional region of the isotropic phase: 5OCB and MBBA and their mixtures - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Liquid Crystals Année : 2012

The structures and conformations of mesogenic molecules in the pre-transitional region of the isotropic phase: 5OCB and MBBA and their mixtures

G. de Luca
Lyndon Emsley
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Anne Lesage

Résumé

A nuclear magnetic resonance spectrometer operating with a magnetic field of 23.49 T, corresponding to 1000 MHz for protons, has been used to study mesogenic molecules N-(4-methoxybenzylidene)-4-butylaniline (MBBA) and 4-pentyloxy-4'-cyanobiphenyl (5OCB) and their approximately equimolar mixture at temperatures above the isotropic to nematic phase transition. In this strong magnetic field, B-0, the molecules acquire a strong partial alignment whose magnitude depends on B-0(2), and also on the anisotropic intermolecular interactions, which grow in strength as the isotropic to nematic phase transition is approached. The well-resolved spectra obtained are analysed to obtain magnetic field induced dipolar couplings between proton (H-1), and between H-1 and carbon nuclei, which are used to investigate the structure, conformational distribution and orientational order in both the pure compounds and in their mixtures.
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Dates et versions

hal-00977881 , version 1 (11-04-2014)

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Citer

G. de Luca, Lyndon Emsley, Anne Lesage, D. Merlet. The structures and conformations of mesogenic molecules in the pre-transitional region of the isotropic phase: 5OCB and MBBA and their mixtures. Liquid Crystals, 2012, 39 (2), pp.211-219. ⟨10.1080/02678292.2011.631043⟩. ⟨hal-00977881⟩
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