Near-infrared reversible photoswitching of an isolated azobenzene-stilbene dye

Eduardo Carrascosa, James N. Bull, Jack T. Buntine, Gabriel da Silva, Paulo F. Santos, Evan J. Bieske

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Photoswitching of a charged azobenzene-stilbene dye is investigated through laser excitation in a tandem ion mobility mass spectrometer. Action spectra associated with E→Z and Z→E photoisomerisation of the stilbene group exhibit bands at 685 and 440 nm, corresponding to S1←S0 and S3←S0 transitions, respectively. The data suggest that isomers possessing a Z configuration of the azobenzene unit rapidly convert to E isomers and are not discernible using ion mobility spectrometry, and that photoisomerisation occurs through excited state dynamics rather than statistical isomerisation on the ground state potential energy surface.
Original languageEnglish
Article number137065
Number of pages5
JournalChemical Physics Letters
Early online date2 Jan 2020
Publication statusPublished - 16 Feb 2020


  • Action spectroscopy
  • Ion mobility
  • Photoisomerisation
  • Photoswitch
  • Stilbene

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