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A phenanthro[9,10-d]imidazole-based AIE Active Fluorescence Probe for Sequential Detection of Ag

A phenanthro[9,10-d]imidazole-based AIE Active Fluorescence Probe for Sequential Detection of Ag

Fanqiang Bu, Bing Zhao, Wei Kan, Liyan Wang, Bo Song, Jianxin Wang, Zhe Zhang, Qigang Deng, Guangming Yin

Spectrochim Acta A Mol Biomol Spectrosc. 2019 Dec 5;223:117333.

PMID: 31280125

Abstract:

Ag+ and SCN- play extremely important roles in the fields of the physiology and environment. In this work, on the basis of phenanthro[9,10-d]imidazole derivative (DIPIP) which can exhibit the aggregation-induced emission (AIE) properties in aqueous solution, we achieved a sequential on-off-on switch for Ag+ and SCN- with high selectivity and sensitivity. A remarkable fluorescence quenching effect of Ag+ on the probe DIPIP was observed with 1:2 stoichiometry, Subsequently, the fluorescence intensity of in situ generated DIPIP-Ag+ ensemble was easily switched on after the interaction between Ag+ and SCN-, which was attributed to the stronger affinity of SCN- to capture Ag+. In particular, the extreme limits of detection (LOD) for Ag+ and SCN- in standard solutions were as low as to be 74.5 nM and 7.8 nM, respectively. Furthermore, the probe DIPIP and the DIPIP-Ag+ ensemble could be used to detect Ag+ in the real water and SCN- in smoker saliva samples, respectively. In addition, the sequential "on-off-on" fluorescence mode of DIPIP to Ag+ and SCN- were also successfully applied in living HeLa cells.

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