A New Fluorescent "Turn-Off" Coumarin-Based Chemosensor: Synthesis, Structure and Cu-Selective Fluorescent Sensing in Water Samples


Karaoglu K. , Yilmaz F. , Mentese E.

JOURNAL OF FLUORESCENCE, vol.27, no.4, pp.1293-1298, 2017 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 27 Issue: 4
  • Publication Date: 2017
  • Doi Number: 10.1007/s10895-017-2062-x
  • Title of Journal : JOURNAL OF FLUORESCENCE
  • Page Numbers: pp.1293-1298

Abstract

We report the synthesis and characterization two coumarin-based fluorescence probes, N'-{[7-(diethylamino)-2-oxo-2H-chromen-3-yl]carbonyl}pyridine-3-carbohydrazide (3) and N'-benzoyl-7-(diethylamino)-2-oxo-2H-chromene-3-carbohydrazide (4), proposed as a novel fluorescent chemosensor. The two probes designed showed an instant turn-off fluorescence response to Cu2+ over other metal ions in ethanol-water mixture based on intramolecular charge transfer (ICT). It was found that pyridine-analogue coumarin is highly selective and sensitive sensor for Cu2+. The 3 sensor coordinates Cu2+ in 1:1 stoichiometry with a binding constant, K-a = 5.22 M-1 and the detection limit was calculated 1.97 x 10(-9) M.