Chemosensor properties of 7-hydroxycoumarin substituted cyclotriphosphazenes?

Authors: GÖNÜL YENİLMEZ ÇİFTÇİ, SERGEN YILMAZ, NAGİHAN BAYIK, ELİF ŞENKUYTU, ESRA NUR KAYA, MAHMUT DURMUŞ, MUSTAFA BULUT

Abstract: The newly synthesized cyclotriphosphazene cored coumarin chemosensors 5, 6, and 7 were successfully characterized by $^{1}$H NMR, $^{31}$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$^{+}$ , Mg2$^{+}$ , Ca2$^{+}$ , Ba2$^{+}$ , Cr3$^{+}$ , Mn2$^{+}$ , Fe3$^{+}$ , Co2$^{+}$ , Al3$^{+}$ , Hg$^{+}$ , Cu2$^{+}$ , Zn2$^{+}$ , Ag$^{+}$ , and Cd2$^{+}$) . The fluorescence titration results showed that compounds 5, 6, and 7 could be employed as fluorescent chemosensors for Fe3$^{+}$ ions with high sensitivity. The complex stoichiometry between final cyclotriphosphazene chemosensors and Fe3$^{+}$ ions was also determined by Job's plots.

Keywords: Cyclotriphosphazene, coumarin, fluorescent chemosensor, aqueous media

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