Title
Highly Selective Turn-on Fluorescent Chemodosimeter for Al(III) Detection via Al(III)-Promoted Hydrolysis of Carbon-Nitrogen Double Bond in 8-Hydroxyquinoline Aldehyde Schiff Base
Author
Jinmin Wang, Yuanyuan Li, Kai Li, Xiangru Meng, Hongwei Hou
Year
2017
Journal
Chemistry A European Journal
Abstract
Fluorescent chemodosimeters based on small organic molecules are widely used in the detection of various analytes. However, chemodosimeters for metal ions detections are still limited in a few transition metals like Hg (II), Cu (II), Fe (III), Au(III), etc. In this work, a fluorescent chemodosimeter of 5-chloro-7-phenyliminomethyl-8-hydroxyquinoline (2) for the detection of Al(III) was reported. Chemodosimeter 2 exhibited a turn-on fluorescence response to Al(III) due to an Al(III)-promoted hydrolysis of carbon-nitrogen double bond reaction. This reaction yielded a product of 1-Al complex which exhibited high fluorescence emission at 487 nm based on an inhibition of excited-state intramolecular proton transfer (ESIPT) mechanism. Because of the specific catalytic ability of Al(III), the selectivity of 2 to Al(III) is excellent both in aqueous solutions and in solid matrix. The fluorescence enhancement was as high as 582-fold and the turn-on fluorescence can be observed even by naked eye upon an irradiation of UV lamp. The detection limit of 2 for Al(III) sensing is 54 nmol/L and the linear range is 0-50 μmol/L. This work provided a new strategy for designing main group metal chemodosimeter based on small organic molecules.
Instrument
FP-8300
Keywords
Fluorescence, Photoluminescecnce, Sesnors, Materials