Fluorous 'ponytails' lead to strong gelators showing thermally induced structure evolution

Appending perfluoroalkyl substituents to bis(urea) gelators results in significantly decreased inter-chain interactions with markedly thinner fibres and hence more cross-linked and more transparent gels with potential applications in the crystallisation of fluorinated pharmaceuticals. Gel structure...

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Bibliographic Details
Published in:Soft matter 2015-01, Vol.11 (43), p.8471-8478
Main Authors: Kumari, Harshita, Armitage, Sarah E, Kline, Steven R, Damodaran, Krishna K, Kennedy, Stuart R, Atwood, Jerry L, Steed, Jonathan W
Format: Article
Language:English
Subjects:
Crystallization
Crystallography, X-Ray
Evolution
Fibres
Fluorination
Fluorocarbons - chemistry
Gels - chemistry
Materials Testing
Neutron Diffraction
Scattering, Small Angle
Solvents
Styrene acrylonitrile resins
Thermal cycling
Urea - analogs & derivatives
Urea - chemistry
X-rays
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Summary:Appending perfluoroalkyl substituents to bis(urea) gelators results in significantly decreased inter-chain interactions with markedly thinner fibres and hence more cross-linked and more transparent gels with potential applications in the crystallisation of fluorinated pharmaceuticals. Gel structure has been probed by detailed SANS measurements which indicate a surprising structure evolution on thermal cycling, not seen for hydrocarbon analogues. The SANS data are complemented by the single crystal X-ray structure of one fluorinated gelator.
ISSN:1744-683X
1744-6848
DOI:10.1039/c5sm01865j