Chemosensor for fluoride ion based on chromone

- A simple and efficient chemosensor R has been synthesized based on chromone.
- Receptor R for fluoride with a 118 nm red shift response.
- Job's plot and B-H equation indicate R associates with F− in a 1:1 stoichiometry.
- No significant interference was observed for other anions.
- Receptor R is an efficient naked eye detector for F− ion.