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Organized Collapse Structures in Mixtures of Chiral Ethyl 2-Azido-4-fluoro-3-hydroxystearates
journal contribution
posted on 2006-02-14, 00:00 authored by Silke Steffens, Jens Oldendorf, Günter Haufe, Hans-Joachim GallaMonolayers of enantiomeric compounds as well as diastereomeric mixtures and racemic/diastereomeric mixtures
of ethyl 2-azido-4-fluoro-3-hydroxystearates have been investigated using surface pressure−area isotherms and Brewster
angle microscopy. All monolayers collapse out of the liquid-expanded phase, forming 3D collapse structures which
were visualized with scanning force microscopy. The enantiomeric compound and the diastereomeric mixtures form
unique fiber-like network structures with heights between 20 and 40 nm. Interestingly, the shape of the enantiomeric
fiber structures is straight, whereas the diastereomeric mixtures exhibit curved fibers of different sizes. The racemic
mixture however forms circular 10 nm high and 20−50 μm broad structures. The shape of unconventional collapse
structures could be changed by using distinct ratios of diastereomeric or racemic/diastereomeric mixed compounds.
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monolayers collapsediastereomeric mixtures form40 nmracemic mixturecollapse structuresenantiomeric fiber structuresscanning force microscopyenantiomeric compoundOrganized Collapse Structuresdiastereomeric mixtures exhibit3 D collapse structuresBrewster angle microscopyenantiomeric compoundsdiastereomeric mixtures10 nm
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