文献类型：期刊文献

英文题名：Ratiometric Hg2+/Ag+ Probes with Orange Red-White-Blue Fluorescence Response Constructed by Integrating Vibration-Induced Emission with an Aggregation-Induced Emission Motif

作者：Li, Yiru[1,2];Liu, Yang[1,2];Zhou, Haitao[1,2];Chen, Wei[1,2];Mei, Ju[1,2];Su, Jianhua[1,2]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Inst Fine Chem, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2017

卷号：23

期号：39

起止页码：9280

外文期刊名：CHEMISTRY-A EUROPEAN JOURNAL

收录：;EI(收录号：20172903948086);WOS:【SCI-EXPANDED(收录号:WOS:000405284900011)】；

基金：We gratefully acknowledge financial support from the Programme of Introducing Talents of Discipline to Universities (B16017), NSFC/China (21604023, 21421004), and the Fundamental Research Funds for the Central Universities (222201717003, 222201714011).

语种：英文

外文关键词：aggregation-induced emission (AIE); mercury ion; ratiometric fluorometric probes; silver ion; vibration-induced emission (VIE)

摘要：Two novel ratiometric fluorometric probes 6a and 6b have been designed and synthesized for the detection of Hg2+ and Ag+, respectively. Each of these probes is comprised of a 9,14-diphenyl-9,14-dihydrodibenzo[a, c] phenazine (DPAC) skeleton, a tetraphenylethylene (TPE) unit, and two thymine/adenine groups. In this proof-of-concept work, the DPAC unit featuring vibration-induced emission (VIE) characteristics serves as a dual-emission chromogen, whereas the TPE moiety, which is noted for its aggregation-induced emission (AIE) properties, functions mainly as a signal amplifier. The coordination between the thymine/adenine groups and Hg2+/Ag+ leads to the formation of aggregates, which restricts the intramolecular vibrations of DPAC and the intra-molecular rotations of TPE, activating the AIE effect of TPE and resulting in the bent form of DPAC. Accordingly, the overall fluorescence changed from moderate orange-red (Iorange-red) to intense blue light (I-blue) passing through the white-light region, concurrently with an enhancement of fluorescence at 475 nm and a dramatic increase in the ratio of I-blue/Iorange-red. Furthermore, the superb sensitivity of 6a/6b towards Hg2+/Ag+ has been demonstrated by the detection limit, which is as low as 6.1 nm and 0.1 mu m, respectively. Both of these values are below the maximum concentration in drinking water permitted by the U.S. Environmental Protection Agency, demonstrating their great potential to be applied for real-world metal-ion sensing.