A colorimetric and ratiometric fluorescent chemosensor for fluoride based on proton transfer.
N-Phenyl-N'-(3-quinolinyl)urea (1) has been developed as a highly selective colorimetric and ratiometric fluorescent chemosensor for fluoride ion based on a proton transfer mechanism. Evidences for the mechanism were provided by UV-vis and fluorescence titration and especially (1)H and (19)F NMR experiments. The sensor gave the largest ratiometric fluorescent response reported so far (R(max)/R(min) = 2620) to fluoride. Taking H(+) as the "recovering reagent", the sensor can be reversibly "used" and "recovered" for several cycles with only a slight decay of the response ability.
State Key Laboratory for Oxo Synthesis & Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.
Chuandong
C
Jia
Biao
B
Wu
Jianjun
J
Liang
Xiaojuan
X
Huang
Xiao-Juan
XJ
Yang
D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D003116:Color; D003124:Colorimetry; D005459:Fluorides / Q000032:analysis* / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D011522:Protons; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D014508:Urea / Q000737:chemistry
D011522:Protons; D014508:Urea; D005459:Fluorides