title: Amplifying emission enhancement and proton response in a two-component gel.
abstract: A glutamide gelator, 1, was synthesized, and a weak emission enhancement was observed during its gelation. In addition, 1 could be an excellent scaffold for successfully embedding an energy acceptor, 2, into its aggregate to obtain highly efficient energy transfer. An amplification of the emission enhancement was observed in the two-component gels compared to that of the neat gel of 1 during gel formation. For example, 1 induced only a 2.5-fold increase in emission intensity, whereas a 23-fold enhanced emission could be observed in the two-component gel with only 1.6 mol % 2. Furthermore, two-component gels had an excited proton response. In systems with low acceptor concentrations, the hot solution red-shifted the fluorescence from blue to yellow upon the addition of a proton, which continuously blue-shifted with decreasing temperature to form the gel given that the binding of the gelator to the proton is weakened during coassembly. Moreover, the casting film formed by the two-component wet gel had an excellent response to volatile acids such as hydrochloric acid, trifluoroacetic acid, and so on and could be reversibly recovered by exposure to NH(3).
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699# Changchun, 130061, China. xuepengchong@jlu.edu.cn
authors.forename: Pengchong
authors.initials: P
authors.lastname: Xue
authors.forename: Ran
authors.initials: R
authors.lastname: Lu
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.forename: Junhui
authors.initials: J
authors.lastname: Jia
authors.forename: Qiuxia
authors.initials: Q
authors.lastname: Xu
authors.forename: Tierui
authors.initials: T
authors.lastname: Zhang
authors.forename: Makoto
authors.initials: M
authors.lastname: Takafuji
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Ihara