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Persistent URL http://purl.org/net/epubs/work/54449
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Record Id 54449
Title Self-assembling chiral gelators for fluorinated media
Abstract Formulations involving partially and fully fluorinated media represent a technological challenge given the lipophobic and hydrophobic nature of such liquids. The identification of self-associating materials with which to control the viscosity and solubilizing characteristics of fluorinated solvents is a particularly interesting area of research. It is shown here that the presence of the tereogenic centers inherent in a family of bis-(R,&946;-dihydroxy ester)s is an essential equirement for the thermoreversible gelation of mixtures of partially fluorinated liquids 2H,3H-perfluoropentane (HPFP) and 1H,1H-heptafluorobutanol (HFB). Gelation is driven by hydrogen bonding, which induces a nonpreferred conformation around the bis-(R,&946;-dihydroxy ester) structural motif. An analysis of the melting temperature yields an enthalpy of melting that is consistent with three to four hydrogen bonds, commensurate with the end-group structure of the gelator. Small-angle neutron scattering demonstrated the existence of the common fibrillar structures whose dimensions showed no obvious correlation with the molecular structure of the gelator.
Organisation ISIS , ISIS-LOQ , STFC
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Language English (EN)
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Journal Article Langmuir 25, no. 15 (2009): 8678-8684. doi:10.1021/la804277z Griffiths_Cote_Chiral_Gelators.pdf 2009