Chemosensor properties of 7-hydroxycoumarin substituted cyclotriphosphazenes

The newly synthesized cyclotriphosphazene cored coumarin chemosensors 5, 6, and 7 were successfully characterized by H NMR, P NMR, and MALDI-TOF mass spectrometry. Additionally, the photophysical and metal sensing properties of the targeted compounds were determined by fluorescence spectroscopy in the presence of various metals (Li , Na , K , Cs , Mg , Ca , Ba , Cr , Mn , Fe , Co , Al , Hg , Cu , Zn , Ag , and Cd ) . The fluorescence titration results showed that compounds 5, 6, and 7 could be employed as fluorescent chemosensors for Fe ions with high sensitivity. The complex stoichiometry between final cyclotriphosphazene chemosensors and Fe ions was also determined by Job's plots.