title: [Spiropyran-based fluorescent sensor for Hg2+, Cr3+, Ag+ and their interaction spectra].
abstract: A 6',8'-di-tert-butyl-1-hydroxyethyl-3,3-dimethyl-indoline benzospiropyran L1 and its derivative L2 were synthesized and characterized. Chelation-enhanced appearswhen L1 with electron donating groups of 6', 8'-di-tert-butyl touch on benzospiropyran and affect the stability of cyanine structure. L1 exhibited high selectivity to Hg2+, Cr3+, Ag+ over other metal ions. While, there was no obvious interferences of coexist metal ions on Hg2+, Cr3+, Ag+ detection. The Hg2+, Cr+, Ag+ recognition of L1 not only could be achieved by means of fluorescense and absorption "turn-on" spectra but also an obvious color change from colorless to yellowish by naked-eyes. The binding of L1 to Ag+, Cr3+, Hg2+ are in 1 : 1 stoichometry and the detection limits are 7.435 8 x 10(-6), 6.126 8 x 10(-6), 3.452 4 x 10(-6) mol x L(-1). The sensing mechanism was also investigated from L2.
authors.affiliation: Department of Chemistry and Chemical Engineering, University of Science and Technology Beijing, Beijing 100083, China. libinlian666@126.com
authors.forename: Bin-Lian
authors.initials: BL
authors.lastname: Li
authors.forename: Yun-Xu
authors.initials: YX
authors.lastname: Yang
authors.forename: Zhang-Long
authors.initials: ZL
authors.lastname: Chen
authors.forename: Wen
authors.initials: W
authors.lastname: Han
authors.forename: Hai-Bo
authors.initials: HB
authors.lastname: Zhu