期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 21, 期 12, 页码 4712-4720出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201405074
关键词
fluorescence; fluorophores; nanofibers; organogels; sensors
资金
- National Natural Science Foundation of China [21103067, 51403020, 21374041]
- Youth Science Foundation of Jilin Province [20130522134JH]
- State Key Laboratory of Supramolecular Structure and Materials [SKLSSM201407]
- State Laboratory of Theoretical and Computational Chemistry [K2013-02]
Two L-phenylalanine derivatives with 5,8-bis(2-(carbazol-3-yl)vinyl)quinoxaline (PCQ) and 5,8-bis[2-(carbazol-3-yl)]-2,3-dimethylquinoxaline (DCQ) as fluorophores were synthesized, and their photophysical properties were measured and compared. The two compounds were found to gelate some organic solvents and self-assemble into 1D nanofibers in gels. The wet gel of PCQ emitted a weak orange fluorescence, but the DCQ gel had a strong green one. This result can be due to the presence of two methyl groups and the nonplanar conformation of fluorophore in DCQ. The gel film of DCQ also showed significantly stronger fluorescence than that of PCQ. Thus, the wet gel and xerogel film of DCQ were selected to study their sensing properties to acids. The yellow wet gel of DCQ transformed into a brown sol upon the addition of 0.2equiv trifluoroacetic acid (TFA), accompanied by emission quenching. The xerogel film of DCQ rapidly responded to volatile acids, such as TFA, HCl, and HOAc. The fluorescence of the xerogel film was gradually quenched with increased concentration of volatile acid vapors. The fibrous film exhibited low detection limits for volatile acid. The detection limits of the thin films for TFA, HCl, and HOAc reached 43, 122, and 950ppb, respectively.
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