A new colorimetric and fluorescent bis(coumarin)methylene probe for fluoride ion detection based on the proton transfer signaling mode

作者：Mahapatra Ajit Kumar^*; Maiti Kalipada; Sahoo Prithidipa; Nandi Prasanta Kumar

来源：Journal of Luminescence, 2013, 143: 349-354.

DOI：10.1016/j.jlumin.2013.05.002

• Anion recognition
• Fluorescent probe
• Turn on
• Coumarin
• DFT

A new turn-on fluorescent and colorimetric sensor, oxidized bis(coumarin)methane (1) for fluoride in acetonitrile was designed and synthesized. The binding ability evaluated by UV-vis and fluorescence titration experiments reveals that 1 can selectively interact with fluoride. Upon addition of fluoride to receptor 1 in acetonitrile solution, the appearance of a new absorption band around 349 nm showed a color change from colorless to yellow, which can provide a way of 'naked eye' detection of fluorides. The spectral change of 1 is due to the anion induced deprotonation and hence an increase in charge density and rigidity of the receptor molecule. Furthermore, the binding mode with fluoride was investigated by H-1 NMR titration experiments. Again, the deprotonation of oxidized bis(coumarin) methane 1 is responsible for the color change.

• 出版日期2013-11