期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 330, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.129287
关键词
Imidazolium; PAHs; Nitro compounds; Picric acid; Fluorescent sensor; Optical sensor
资金
- Thailand Research Fund [RSA6280049, DPG6080001]
- Center of Excellence for Innovation in Chemistry (PERCH-CIC), Ministry of Higher Education, Science, Research and Innovation (MHESI), Mahidol University
- CIF Grant, Faculty of Science, Mahidol University
- National Science Technology and Innovation Policy Office for Integrated Research and Innovation Plan [256113A3050001]
Highly water-soluble fluorescent polyaromatic-based imidazolium compounds have been reported to detect a wide range of nitroaromatics in aqueous solution with fully quenched fluorescence. Increased affinity and sensitivity towards nitrophenols were achieved by enhancing the hydrophobicity and pi-pi stacking of the probe.
Highly water-soluble fluorescent polyaromatic-based imidazolium compounds capable of detecting a wide-range of nitroaromatics, e.g., nitrophenols and picric acid in aqueous solution with fully quenched fluorescence are reported. The two probes contained an anthracene and pyrene group with the increased size and angularity of the pyrene ring in pyrene-based imidazolium (PIM) raising the hydrophobicity or pi-pi stacking and sensitivity of the probe towards all mono-, di-, and trinitmphenols even under harsh conditions (pH 4-8). The high affinity for nitrophenols was confirmed by single crystal X-ray crystallography. Time-dependent density functional theory (TD-DFT) reveals cation-anion interactions between the imidazolium and picrate ions causing fluorescent quenching through PET and charge transfer involving a dark S-1 excited state.
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