The real-time monitoring of nitric oxide (NO) at the subcellular level is still a great challenge. To attain this goal, we developed a fast and selective near-infrared (NIR) fluorescent probe for the targeted tracing of endogenous NO. This probe possesses vital features for the real-time detection of intracellular NO including a significant turn-on NIR response, high specificity, and a fast response by a controlled photoinduced electron transfer (PET) process, which is applicable to the real-time monitoring of endogenous NO in mitochondria.
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