Journal article

Reversible Photoswitching of Isolated Ionic Hemiindigos with Visible Light

Eduardo Carrascosa, Christian Petermayer, Michael S Scholz, James N Bull, Henry Dube, Evan J Bieske



Indigoid chromophores have emerged as versatile molecular photoswitches, offering efficient reversible photoisomerization upon exposure to visible light. Here we report synthesis of a new class of permanently charged hemiindigos (HIs) and characterization of photochemical properties in gas phase and solution. Gas-phase studies, which involve exposing mobility-selected ions in a tandem ion mobility mass spectrometer to tunable wavelength laser radiation, demonstrate that the isolated HI ions are photochromic and can be reversibly photoswitched between Z and E isomers. The Z and E isomers have distinct photoisomerization response spectra with maxima separated by 40-80 nm, consistent with theor..

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University of Melbourne Researchers


Awarded by Australian Research Council

Awarded by Deutsche Forschungsgemeinschaft

Awarded by Deutsche Forschungsgemeinschaft [Emmy-Noether fellowship]

Awarded by Austrian Science Fund (FWF)

Funding Acknowledgements

The authors thank the Australian Research Council for financial support under the Discovery Project Scheme (DP150101427 and DP160100474). H.D. and C.P. thank the Deutsche Forschungsgemeinschaft [(SFB 749/3, A12), Emmy-Noether fellowship (DU 1414/1-1)], and the Cluster of Excellence Center for Integrated Protein Science Munich' (CIPSM) for financial support. E.C. acknowledges support by the Austrian Science Fund (FWF) through a Schrodinger Fellowship (Nr. J4013-N36). M.S.S. thanks the Australian government for an Australian Postgraduate Award scholarship.