title: Highly Selective Turn-On Fluorescent Chemodosimeter for AlIIIDetection through AlIII-Promoted Hydrolysis of C=N Double Bonds in the 8-Hydroxyquinoline Aldehyde Schiff Base.
abstract: Fluorescent chemodosimeters based on small organic molecules are widely used in the detection of various analytes. However, chemodosimeters for metal ion detection are still limited to a few transition metals, such as HgII, CuII, FeIII, AuIII, etc. In this work, a fluorescent chemodosimeter of 5-chloro-7-phenyliminomethyl-8-hydroxyquinoline (2) for the detection of AlIIIis reported. Chemodosimeter 2 exhibits a turn-on fluorescence response to AlIIIowing to an AlIII-promoted hydrolysis of carbon-nitrogen double bonds. This reaction yielded a 1-Al complex, which exhibited high fluorescence emission at 487 nm based on inhibition of excited-state intramolecular proton transfer (ESIPT). Because of the specific catalytic ability of AlIII, the selectivity of 2 to AlIIIis 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 the naked eye upon an irradiation with a UV lamp. The detection limit of 2 for AlIIIsensing is 54 nmol L-1and the linear range is 0-50 μmol L-1. This work provides a new strategy for designing main-group-metal chemodosimeters based on small organic molecules.
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University, Henan, 450001, P. R. China.
authors.forename: Jinmin
authors.initials: J
authors.lastname: Wang
authors.affiliation: School of Chemistry and Chemical Engineering, Henan University of Technology, Henan, 450001, P. R. China.
authors.forename: Yuanyuan
authors.identifier: http://orcid.org/0000-0003-2155-0901
authors.initials: Y
authors.lastname: Li
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University, Henan, 450001, P. R. China.
authors.forename: Kai
authors.identifier: http://orcid.org/0000-0001-9458-4796
authors.initials: K
authors.lastname: Li
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University, Henan, 450001, P. R. China.
authors.forename: Xiangru
authors.initials: X
authors.lastname: Meng
authors.affiliation: College of Chemistry and Molecular Engineering, Zhengzhou University, Henan, 450001, P. R. China.
authors.forename: Hongwei
authors.initials: H
authors.lastname: Hou
keywords: Schiff base; aluminium ions; chemodosimeter; fluorescence; hydrolysis