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Title: Supramolecular organization and heterochiral recognition in Langmuir monolayers of chiral azobenzene surfactants
Author: Pulido Companys, Alba
Albalat Piñol, Rosa
Garcia Amorós, Jaume
Velasco Castrillo, Dolores
Ignés i Mullol, Jordi
Keywords: Quiralitat
Agents tensioactius
Surface active agents
Issue Date: 6-Aug-2013
Publisher: American Chemical Society
Abstract: We study the self-assembly of novel azobenzene-based chiral surfactants at the air/water interface, and find that while the pure enantiomers lack the ability to organize in ordered mesophases, the racemic mixture spontaneously forms a hexatic phase at low lateral pressures, which we detect by means of Brewster angle microscopy. This work provides a unique example of heterochiral recognition in which the racemic monolayer is not only condensed with respect to the pure enantiomers, but causes an ordered mesophase to form. Although hexatic order vanishes at high surface pressures, long-range orientational order is regained for all compositions upon monolayer collapse, which proceeds through the formation of birefringent trilayers with a well-defined lateral microstructure, as revealed by atomic force microscopy.
Note: Versió postprint del document publicat a:
It is part of: Langmuir, 2013, vol. 29, num. 31, p. 9635-9642
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ISSN: 0743-7463
Appears in Collections:Articles publicats en revistes (Química Inorgànica i Orgànica)
Articles publicats en revistes (Ciència dels Materials i Química Física)

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