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Furocoumarin (furo[3,2-c]coumarin) derivatives have been synthesized from single step, high yielding (82–92%) chemistry involving a 4-hydroxycoumarin 4 + 1 cycloaddition reaction. They are characterized by FTIR,  1 H-NMR, and, for the first time, a comprehensive UV-Vis and fluorescence spectroscopy study has been carried out to determine if these compounds can serve as useful sensors. Based on the fluorescence data, the most promising furocoumarin derivative (2-(cyclohexylamino)-3-phenyl-4H-furo[3,2-c]chromen-4-one,  FH ), exhibits strong fluorescence (ФF = 0.48) with long fluorescence lifetime (5.6 ns) and large Stokes’ shift, suggesting  FH  could be used as a novel fluorescent chemosensor. FH exhibits a highly selective, sensitive and instant turn-off fluorescence response to Fe 3+  over other metal ions which was attributed to a charge transfer mechanism. Selectivity was demonstrated against 13 other competing metal ions (Na + , K + , Mg 2+ , Ca 2+ , Mn 2+ , Fe 2+ , Al 3+ , Ni 2+ , Cu 2+ , Zn 2+ , Co 2+ , Pb 2+  and Ru 3+ ) and aqueous compatibility was demonstrated in 10% MeOH-H 2 O solution. The  FH  sensor coordinates Fe 3+  in a 1:2 stoichiometry with a binding constant, K a  = 5.25 × 10 3  M −1 . This novel sensor has a limit of detection of 1.93 µM, below that of the US environmental protection agency guidelines (5.37 µM), with a linear dynamic range of ~28 (~2–30 µM) and an R 2  value of 0.9975. As an exemplar application we demonstrate the potential of this sensor for the rapid measurement of Fe 3+  in mineral and tap water samples demonstrating the real-world application of FH as a “turn off” fluorescence sensor.

Furo[3,2-c]coumarin-derived Fe3+ Selective Fluorescence Sensor: Synthesis, Fluorescence Study and Application to Water Analysis