Abstract
A new fluorescent turn-on probe for HSO3− bearing a benzo[e]indolium moiety was developed. The HSO3− undergoes 1,4-addition reaction with the C-4 atom in the ethylene group, resulting in a prominent fluorescence enhancement and a fluorescent color change. The reaction could be completed in 1min in PBS buffer, and displayed a high selectivity and sensitivity for HSO3− against other anions, including CN−. Moreover, the practical value of the probe was confirmed by application to detect the level of HSO3− in sugar samples.
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