Journal article

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

Chemical Physics Letters | Elsevier Inc. | Published : 2020

Abstract

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.

Grants

Awarded by Australian Research Council


Funding Acknowledgements

This research was funded through the Australian Research Council (ARC) Discovery Project scheme (DP150101427 and DP160100474), and Future Fellowship scheme (FT130101304). E.C. acknowledges support by the Austrian Science Fund (FWF) through a Schrödinger Fellowship (Nr. J4013-N36), and J.T.B. acknowledges The University of Melbourne for a Melbourne Research Scholarship (MRS) and the Australian Government for an Australian Research Training Program Scholarship (RTP).