Journal Highlight: Novel rhodamine B and 2H‐benzo[b][1,4]oxazin‐3(4H)‐one‐derived fluorescent sensor for low pH value detection

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  • Published: Aug 7, 2019
  • Author: spectroscopyNOW
  • Channels: UV/Vis Spectroscopy
thumbnail image: Journal Highlight: Novel rhodamine B and 2<em>H</em>‐benzo[<em>b</em>][1,4]oxazin‐3(4<em>H</em>)‐one‐derived fluorescent sensor for low pH value detection

The colour variation of a new fluorescent probe fusing the rhodamine B scaffold with the 2H‐benzo[b][1,4]oxazin‐3(4H)‐one moiety has shown that it can be used as a low‐cost optical sensor for the naked eye detection of protons in Britton–Robinson buffer.

Chen, M., Bai, X., Qi, Z. et al. (2019). Novel rhodamine B and 2H‐benzo[b][1,4]oxazin‐3(4H)‐one‐derived fluorescent sensor for low pH value detection. Bulletin of the Korean Chemical Society online

Abstract: A new fluorescent probe L fusing the rhodamine B scaffold with 2H‐benzo[b][1,4]oxazin‐3(4H)‐one moiety has been developed and applied as an acidic pH sensor. The ultraviolet (UV) and fluorescence spectra of the probe at different pH values were investigated in B–R buffer/MeOH (v:v = 3: 7). This probe showed increase of both the UV–Vis absorption and fluorescence emission from alkaline/neutral to acidic condition, reaching a strongest intensity at pH 2.13, but the intensities decreased when the pH decreased to 1.83. The color variation along the pH changes proved that the probe L can be used as a low‐cost optical sensor for the naked eye detection of proton in the present buffer.

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