Selective Fluorescent Sensing for Iron in Aqueous Solution by A Novel Functionalized Pillar[5]arene

Iron ion is one of the most physiologically important elements in metabolic processes, indispensable for all living systems. Since its excess can lead to severe diseases, new approaches for its monitoring in water samples are urgently needed to meet requirements. Here, we firstly report a novel and universal route for the synthesis of a series of pillar[n]arene derivates containing one benzoquinone unit by photocatalysis. With this in hand, an anthracene - appended water - soluble pillar[5]arene (H) with excellent fluorescence sensing potency was prepared. H enabled the ultrasensitive detection of iron ions in aqueous solution with limits of detection of 10-8 M. Over a wide range of metal ions, H exhibited specific selectivity toward Fe3+. More importantly, H could still properly operate in a simulated sewage sample, coexisting with multiple interference ions. An anthracene-appended water-soluble pillar[5]arene was prepared to construct a supramolecular fluorescent sensor system to accurately and selectively detect Fe3+ in water.image

Automated summary

A novel synthesis method for pillar[n]arene derivatives was reported in this study, and a water-soluble pillar[5]arene with fluorescence sensing capability was prepared. The pillar[5]arene exhibited ultrasensitive detection of iron ions in aqueous solution with specific selectivity. Moreover, the sensor could operate properly in a simulated sewage sample containing multiple interference ions.