Fluorescence probe for the fast and sensitive detection and imaging of ONOO−via regulation of charge distribution†

Abstract

A rapid, sensitive and selective ONOO⁻ probe was developed using a cyanine dye bearing a meso-quinolinium group. The quinolinium group plays a pivotal role in the performance, as it modulates the signal-to-noise ratio and the reactivity of towards ONOO⁻, thereby substantially improving both sensitivity and selectivity.