An A–π–A′ structural ratiometric fluorescent probe based on benzo[e]indolium for bisulfite and its application in sugar samples and living cells

Abstract

An A–π–A′ structural ratiometric fluorescent probe <bold>1</bold> bearing a benzo[<italic>e</italic>]indolium moiety was developed for the detection of HSO₃⁻ in PBS buffer solution.