Journal
JOURNAL OF MATERIALS CHEMISTRY B
Volume 1, Issue 6, Pages 819-827Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2tb00150k
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- National Science Council, Taiwan [NSC 99-2118-E-213-001, NSC 99-2119-M-033-001, NSC 99-2119-M-033-002, NSC 100-2119-M-033-001, NSC 101-2120-M-033-001]
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We propose a facile approach toward enhancing the efficiency of fluoride-responsive gels through the positioning of functionalized receptor units, allowing tunable intra-and intermolecular hydrogen bonding, in the gelator molecules. We prepared the new glycolipid-based gelator 2 and its hydroxy and methoxy derivatives 2a and 2b, respectively, to study the effects of three types modes of supramolecular assembly: solely intermolecular hydrogen bonding in 2, solely intramolecular hydrogen bonding in 2b, and both inter-and intramolecular hydrogen bonding in 2a. H-1 NMR spectra confirmed the self-assembly interactions of these glycolipid-based gelators. We measured the minimum gel concentrations and sol-gel transitions and recorded X-ray diffraction patterns and electron micrographs to characterize the gelation behavior and structural organization of each of these supramolecular gels. Among these three gelators, only 2 and 2a could form organogels in the test solvents, indicating that intermolecular hydrogen bonding plays a determinant role in the supramolecular assemblies leading to gelation. The self-assembly of 2 resulted in a bilayer-packed lamellar structure within ribbon-like fibers, whereas that of 2a resulted in hexagonally packed cylindrical micelles within tree-like fibers. A minimum amount of 0.3 equivalent of F was required for complete disruption of the gel formed from 2a, which was approximately four times lower than that required for the gel formed from 2. Thus, the incorporation of a beta-hydroxy motif-the only difference in the chemical structures of 2 and 2a-led to interesting variations in the resulting gel morphologies and enhanced the gel's fluoride-responsiveness.
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