Fluorescent recognition of Fe3+ ion with photoinduced electron transfer (PET) sensor

We synthesized a fluorescence receptor 2,2-(pyridine-2,6-diylbis(azanediyl))bis(methylene)diphenol (2) and report it as a photoinduced electron transfer (PET) cation sensor that is capable of indicating the presence of Fe3+ ion via a fluorescence signal. It was observed that fluorescence intensity changes and quenched. The association constant (Ka) of receptor (2) with Fe3+ ions was calculated from Benesi–Hildebrand and Scatchard Plot at 1.60 and 1.30 × 104 M−1 respectively.