This repository contains the experimental data discussed in the manuscript. Including, 1H NMR, 13C NMR (FID and PDF) and Mass Spectra for compounds 4, 5 and probe 3. Fluorescence analysis and UV data of probe 3 including the ONOO- and H2O2 titration curve, selectivity data, Fluorescence intensity changes for probe 3 as a function of time with increasing concentrations of ONOO- (time drive), UV before and after addition of ONOO- cell imaging (exogenous and endogenous) and cell viability.