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Ultrafast vibrational spectroscopic Studies on the photoionization of the α-Tocopherol analogue Trolox C

Parker, AW, Bisby, RH, Greetham, GM, Kukura, P, Scherer, KM and Towrie, M 2014, 'Ultrafast vibrational spectroscopic Studies on the photoionization of the α-Tocopherol analogue Trolox C' , The Journal of Physical Chemistry B, 118 (42) , pp. 12087-12097.

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Abstract

The initial events after photoexcitation and photoionization of α-tocopherol (vitamin E) and the analogue Trolox C have been studied by femtosecond stimulated Raman spectroscopy, transient absorption spectroscopy and time-resolved infrared spectroscopy. Using these techniques it was possible to follow the formation and decay of the excited state, neutral and radical cation radicals and the hydrated electron that are produced under the various conditions examined. α Tocopherol and Trolox C in methanol solution appear to undergo efficient homolytic dissociation of the phenolic –OH bond to directly produce the tocopheroxyl radical. In contrast, Trolox C photochemistry in neutral aqueous solutions involves intermediate formation of a radical cation and the hydrated electron which undergo geminate recombination within 100 ps in competition with deprotonation of the radical cation. The results are discussed in relation to recently proposed mechanisms for the reaction of α-tocopherol with peroxyl radicals, which represents the best understood biological activity of this vitamin.

Item Type: Article
Uncontrolled Keywords: Vitamin E, α-tocopherol, Trolox C, ultrafast, stimulated Raman, time-resolved, infrared, photoionization
Themes: Health and Wellbeing
Schools: Schools > School of Environment and Life Sciences > Biomedical Research Centre
Journal or Publication Title: The Journal of Physical Chemistry B
Publisher: American Chemical Society
Refereed: Yes
ISSN: 1520-6106
Related URLs:
Funders: Science and Technology Facilities Council (STFC)
Depositing User: RH Bisby
Date Deposited: 31 Oct 2014 16:33
Last Modified: 23 Oct 2015 00:38
URI: http://usir.salford.ac.uk/id/eprint/32982

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