Colorimetric and On-Off fluorescent chemosensor for fluoride ion based on diketopyrrolopyrrole

- Novel diketopyrrolopyrrole-derived sensors 1-4 are simple to synthesize.
- Huge color change with fluorescence quenching.
- Sensors 1-4 exhibit fast-responding, selective and sensitive detection for fluoride ion.
- Sensors 1-4 are stable and can be used in reversible manner.