Isomerisation of an intramolecular hydrogen-bonded photoswitch: protonated azobis(2-imidazole)
James N Bull, Michael S Scholz, Neville JA Coughlan, Evan J Bieske
PHYSICAL CHEMISTRY CHEMICAL PHYSICS | ROYAL SOC CHEMISTRY | Published : 2017
Photoisomerisation of protonated azobis(2-imidazole), an intramolecular hydrogen-bonded azoheteroarene photoswitch molecule, is investigated in the gas phase using tandem ion mobility mass spectrometry. The E and Z isomers exhibit distinct spectral responses, with E-Z photoisomerisation occurring over the 360-520 nm range (peak at 460 nm), and Z-E photoisomerisation taking place over the 320-420 nm range (peak at 390 nm). A minor photodissociation channel involving loss of N2 is observed for the E-isomer with a maximum efficiency at 390 nm, blue-shifted by ≈70 nm relative to the wavelength for maximum photoisomerisation response. Loss of N2 is also the predominant collision-induced dissociat..View full abstract
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Awarded by Australian Research Council
This research was funded through the Australian Research Council Discovery Project scheme (DP150101427 and DP160100474). Computational resources were provided by the Australian National Computational Infrastructure (NCI) through award of Early Career Allocation ya1 to JNB.