An Ultra-low Detection Limit Fe Optical Fiber Fluorescent Sensor Based on a Anti-BH Derivative with Aggregation-induced Emission Enhancement.

A fluorescent Fe probe ((CHNO)BH, M1) by introducing two isoquinoline-1-carboxylic acid group into the 6,9-position of anti-BH was designed and synthesized. The structure of M1 was investigated by H NMR, MS, FT-IR and theoretical calculation, and its optical properties were characterized with UV-Vis and PL. M1 showed aggregation induced emission enhancement (AIEE) properties in THF/HO solution, and exhibited an excellent selectivity toward Fe in THF/HO (v/v, ƒw = 95%) solution with a detection limit of 1.93 × 10 M. The interaction mechanism of probe for detecting Fe is attributed to the involvement of intramolecular charge transfer (ICT) process. Furthermore, a optical fiber fluorescent Fe sensor based on M1 sensing film was developed, the detection limit of the optical fiber Fe fluorescent sensor could be improved to13.8 pM, the ultra-low detection limit is superior to most reported fluorescent probes (or sensors) towards Fe. This method has the advantages of high sensitivity, anti-interference and easy to operate, and has great potential in the field of the analysis of environmental and biological samples.