Glycine and l-glutamic acid-based dendritic gelators |
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Authors: | Wu-Song Li Bing-Bing Wang Yen Wei |
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Affiliation: | a Department of Polymer Science and Engineering and Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China b Department of Chemistry, Drexel University, Philadelphia, PA 19104, USA |
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Abstract: | Novel dendrons based on glycine and l-glutamic acid from the first generation (G1) to the third generation (G3) were synthesized and studied for their gelation properties by using transmission electron microscopy (TEM), atomic force microscopy (AFM), fluorescence, IR, circular dichroism (CD), and 1H NMR spectroscopy. It was found that the gelation capability of these dendrons increased from the first generation (G1) to the third generation (G3), and that G3 exhibited the highest efficiency in forming gels. Both the focal and peripheral groups of dendrons had great effects on the formation of organogels. Hydrogen bonding and π-π stacking interactions were proved to be the main driving forces to form the fibrous networks at low concentrations (0.5 wt %). Small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) measurements indicate that the xerogels of the second generation (G2) from ethyl acetate and ethanol, and G3 xerogel from CH2Cl2 all display lamellar structures with the interlamellar spacing of ca. 36.0 Å for G2 and 40.5 Å for G3, respectively. |
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Keywords: | Glycine smallcaps" >l-Glutamic acid Dendritic gelators Self-assembly |
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