Reversible Photoswitching of Isolated Ionic Hemiindigos with Visible Light

Carrascosa, Eduardo, Petermayer, Christian, Scholz, Michael S., Bull, James N., Dube, Henry and Bieske, Evan J. (2020) Reversible Photoswitching of Isolated Ionic Hemiindigos with Visible Light. ChemPhysChem, 21 (7). pp. 680-685. ISSN 1439-4235

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Abstract

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 theoretical predictions for their absorption spectra. Solvation of the HI molecules in acetonitrile displaces the absorption bands to lower energy. Together, gas-phase action spectroscopy and solution NMR and UV/Vis absorption spectroscopy represent a powerful approach for studying the intrinsic photochemical properties of HI molecular switches.

Item Type: Article
Uncontrolled Keywords: 2-way,hemithioindigo,ion mobility,mass spectrometry,molecular switch,photochemistry,photochromism
Faculty \ School: Faculty of Science > School of Chemistry
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Depositing User: LivePure Connector
Date Deposited: 29 Feb 2020 08:34
Last Modified: 30 May 2020 00:00
URI: https://ueaeprints.uea.ac.uk/id/eprint/74343
DOI: 10.1002/cphc.201900963

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