Dipyridylphenylamine-based chemodosimeter for sulfite with optimizing ratiometric signals via synchronous fluorescence spectroscopy

A dipyridyltriphenylamine derivative, (E)-4-(2-nitrovinyl)-N,N-bis(4-(pyridin-4-yl)- phenyl)aniline, was synthesized as a fluorescent probe for detecting sulfite anion. Combining with synchronous fluorescence spectroscopy technology and intramolecular charge transfer molecule, the molecular probe showed narrow full width at half-maximum and minimum overlap of emission spectra across the sensing process.