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[摘要]：The development of new low-mol.-wt. gelators for org. solvents is motivated by several potential applications of gels as advanced functional materials. We developed simple dipeptide-based organogelators with a min. gelation concn. (MGC) of 6-0.15%, wt./vol. in arom. solvents. The organogelators were synthesized using different L-amino acids with nonpolar aliph./arom. residues and by varying alkyl-chain length (C-12 to C-16). The self-aggregation behavior of these thermo-reversible organogels was studied through several spectroscopic and microscopic techniques. A balanced participation of the H bonding and van der Waals interactions is crucial for efficient organogelation, which can be largely modulated by the structural modification at the H-bonding unit as well as by varying the alkyl-chain length in both sides of the hydrophilic residue. Interestingly, these organogelators could selectively gelate arom. solvents from their mixts. with water. the xerogels prepd. from the organogels showed a striking property of adsorbing dyes such as Crystal Violet and Rhodamine 6G from water. This dye-adsorption ability of gelators can be utilized to remove toxic dyes from wastewater. |
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