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.
Kumari, H., Armitage, S. E., Kline, S. R., Damodaran, K. K., Kennedy, S. R., Atwood, J. L., & Steed, J. W. (2015). Fluorous “ponytails” lead to strong gelators showing thermally induced structure evolution. Soft Matter, 11(43), 8471–8478. https://doi.org/10.1039/c5sm01865j