Structure of the smectic B phase formed by linear and branched perfluoroalkyl-alkanes

Article abstract of DOI:10.1080/10587250108025759

The structure of the smectic B phase formed by perfluorodecylalkanes has been analyzed through the synthesis of three molecules and a careful investigation of their mesophases. Molecules with C₈, C₁₀ and a branched C₁₁ alkyl chain were considered. The structure factor analysis of 001 reflexions is consistent with the picture of alternating electron rich and electron poor sublayers. A structural model with segregated perfluoroalkyl chains in the middle of the layer and disordered alkyl chains on each sides is proposed. This model is discussed in terms of space filling arguments: chain lengths, cross section compatibility in the layer and compactness. Infrared dichroic ratios of the CH₂ and CF₂ stretching modes confirm that perfluoroalkyl subunits are perpendicular to the S_B layer while alkyl ones, in a quasi molten state, fill the remaining layer space.

Full text of DOI:10.1080/10587250108025759

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Molecular Crystals and
Liquid Crystals Science
and Technology. Section A.
Molecular Crystals and Liquid
Crystals
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Structure of the Smectic B
Phase Formed by Linear and
Branched Perfluoroalkyl-
Alkanes
F. G. Tournilhac a , P. Bassoul a & R. Cortès b
a Chimie Inorganique et Matériaux Moléculaires
(CNRS ESA 7071), Ecole Supérieure de Physique et
de Chimie Industrielles , 10 rue Vauquelin, 75231,
Paris, Cedex 05, France
b Physique des Liquides et Electrochimie (CNRS
UPR 15), Université Pierre et Marie Curie , 4 place
Jussieu, 75252, Paris, Cedex 05, France
Published online: 24 Sep 2006.
To cite this article: F. G. Tournilhac , P. Bassoul & R. Cortès (2001) Structure of the
Smectic B Phase Formed by Linear and Branched Perfluoroalkyl-Alkanes, Molecular
Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and
Liquid Crystals, 362:1, 45-65, DOI: 10.1080/10587250108025759
To link to this article: http://dx.doi.org/10.1080/10587250108025759
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