Novel functionalized pillar[5]arene: synthesis, assembly and application in sequential fluorescent sensing for Fe3+ and F? in aqueous media

摘要

We designed and synthesised a novel copillar[5]arene PF5 that can through self-inclusion produce strong blue fluorescence. The pillar[5]arene-based chemosensor PF5 could be a sequential fluorescence sensor for ferric ions ( III ) followed by fluoride ions with high sensitivity and selectivity in aqueous solutions. When Fe ~(3+) was added to the solution of the sensor PF5 , the blue fluorescence emission was quenched. After the addition of F ~(?) , the blue fluorescence emission of the PF5 –Fe ~(3+) system returned to the original level. PF5 has specific selectivity to Fe ~(3+) and common cations (Hg ~(2+) , Ag ~(+) , Ca ~(2+) , Cu ~(2+) , Zn ~(2+) , Cd ~(2+) , Ni ~(2+) , Pb ~(2+) , Co ~(2+) , Cr ~(3+) , Mg ~(2+) , Fe ~(2+) , and Al ~(3+) ) could not interfere with the detection process. In addition, PF5 –Fe ~(3+) has specific selectivity to F ~(?) and common anions (Cl ~(?) , Br ~(?) , I ~(?) , AcO ~(?) , NO _(3) ~(?) , HSO _(4) ~(?) , ClO _(4) ~(?) , SCN ~(?) , and CN ~(?) ) and does not interfere with the detection process. The detection limit of the sensor PF5 for Fe ~(3+) was 9.0 × 10 ~(?7) mol L ~(?1) , and the detection limit of F ~(?) was 2.59 × 10 ~(?8) mol L ~(?1) . Moreover, test strips based on the sensor were fabricated, which could be very good sequential test kits for ferric ions ( III ) and fluoride ions. Moreover, the sensor PF5 could also sequentially detect Fe ~(3+) in tap water and F ~(?) in toothpaste.