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9. Amplifying Emission Enhancementand Proton Responsein a Two-Component Gel.

Author

Xue, Pengchong, Lu, Ran, Zhang, Peng, Jia, Junhui, Xu, Qiuxia, Zhang, Tierui, Takafuji, Makoto, and Ihara, Hirotaka

Subjects
*COLLOID synthesis, *PROTONS, *GELATION, *ENERGY transfer, *REDSHIFT, *FLUORESCENCE, *TEMPERATURE effect
Abstract

A glutamide gelator, 1, was synthesized,and a weakemission enhancement was observed during its gelation. In addition, 1could be an excellent scaffold for successfully embeddingan energy acceptor, 2, into its aggregate to obtain highlyefficient energy transfer. An amplification of the emission enhancementwas observed in the two-component gels compared to that of the neatgel of 1during gel formation. For example, 1induced only a 2.5-fold increase in emission intensity, whereasa 23-fold enhanced emission could be observed in the two-componentgel with only 1.6 mol % 2. Furthermore, two-componentgels had an excited proton response. In systems with low acceptorconcentrations, the hot solution red-shifted the fluorescence fromblue to yellow upon the addition of a proton, which continuously blue-shiftedwith decreasing temperature to form the gel given that the bindingof the gelator to the proton is weakened during coassembly. Moreover,the casting film formed by the two-component wet gel had an excellentresponse to volatile acids such as hydrochloric acid, trifluoroaceticacid, and so on and could be reversibly recovered by exposure to NH3. [ABSTRACT FROM AUTHOR]

Published
2013
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