Click synthesis of a quinoline-functionalized hexahomotrioxacalix [3]arene: A turn-on fluorescence chemosensor for Fe~(3+)

摘要

A novel quinoline-functionalized hexahomotrioxacalix[3]arene L was synthesized via Click chemistry and its chemosensing properties with various metal ions were investigated. The chemosensor L exhibited a high selectivity for Fe~(3+) with little interference from other environmentally and biologically relevant metal ions, leading to a prominent 'off-on' type fluorescent signalling behaviour. Our studies demonstrated that the detection limit on fluorescence response of the sensor to Fe~(3+) is in the 10~(-7) M range. The mechanism of the interaction between the L and Fe~(3+) has been investigated in detail by ~1H NMR spectroscopic titration experiments.