6-Methoxy-3-(pyridin-2-yl)-2H-chromen-2-one exhibited fluorescence enhancement in the presence of Fe(iii). This molecule was a selective fluorescent chemosensor for Fe(iii).
A ditopic Schiff base fluorescent chemosensor, L (OFF state), selectively senses Al3+ by inhibition of ESIPT/GSIPT, CN isomerization and CHEF (ON state).