title: Glutamine-containing "turn-on" fluorescence sensor for the highly sensitive and selective detection of chromium (III) ion in water.
abstract: In this study, we reported a new fluorescence sensor for chromium (III) ion, dansyl-L-glutamine (1). The sensor displayed a unique selective fluorescence "turn-on" response to Cr(3+) over other common metal ions in water. Notably, 1 still showed a ratiometric response to Cr(3+) in UV-vis absorption spectra. The binding mechanism of 1 to Cr(3+) was further clarified by using NMR and ESI-MS spectra. The experiment results indicated that the dual-responses of 1 to Cr(3+) should attribute to the coordination of deprotonated sulfonamide group with Cr(3+) and the protonation of the dimethylamino group due to the coordination of Cr(3+) for 1. In addition, two chloride ions also coordinated to the complex of sensor-chromium (III) ion, which further strengthened the conformation of 1-Cr(3+).
authors: School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China.
authors: Meili
authors: M
authors: Zhao
authors: Liguo
authors: L
authors: Ma
authors: Min
authors: M
authors: Zhang
authors: Weiguang
authors: W
authors: Cao
authors: Liting
authors: L
authors: Yang
authors: Li-Jun
authors: LJ
authors: Ma
mesh_terms: D002412:Cations / Q000032:analysis; D002857:Chromium / Q000032:analysis*; D005973:Glutamine / Q000031:analogs & derivatives*; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013056:Spectrophotometry, Ultraviolet; D014867:Water / Q000032:analysis*
chemical_list: D002412:Cations; D014867:Water; D002857:Chromium; D005973:Glutamine
keywords: Chromium (III) ion; Dansyl group; Glutamine; “turn-on” Fluorescence sensor