A mitochondria-targetable fluorescent probe for peroxynitrite: fast response and high selectivityElectronic supplementary information (ESI) available: Experimental procedures, supplemental spectra, and the 1H-, 13C-NMR, and MS spectra. See DOI: 10.1039/c4cc09122a

A mitochondria-targetable fluorescence probe, methyl(4-hydroxyphenyl)amino-substituted pyronin ( 1 ), was exploited, which could highly selectively sense peroxynitrite (ONOO − ) within seconds. A mitochondria-targetable fluorescence probe, methyl(4-hydroxyphenyl)amino-substituted pyronin ( 1 ), was exploited, which could highly selectively sense peroxynitrite (ONOO − ) within seconds.