Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 19, Issue 28, Pages 9234-9241Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201300612
Keywords
gels; nanotubes; self-assembly; solvent effects; supra-molecular chirality
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Funding
- Basic Research Development Program of China [2010CB833305]
- National Natural Science Foundation of China [91027042, 21021003]
- Chinese Academy of Sciences
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The self-assembly of a low-molecular-weight organogelator into various hierarchical structures has been achieved for a pyridylpyrazole linked L-glutamide amphiphile in different solvents. Upon gel formation, supramolecular chirality was observed, which exhibited an obvious dependence on the polarity of the solvent. Positive supramolecular chirality was obtained in nonpolar solvents, whereas it was inverted into negative supramolecular chirality in polar solvents. Moreover, the gelator molecules self-assembled into a diverse array of nanostructures over a wide scale range, from nanofibers to nanotubes and microtubes, depending on the solvent polarity. Such morphological changes could even occur for the xerogels in the solvent vapors. We found that the interactions between the pyridylpyrazole headgroups and the solvents could subtly change the stacking of the molecules and, hence, their self-assembled nanostructures. This work exemplifies that organic solvents can significantly involve the gelation, as well as tune the structure and properties, of a gel.
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