An EPR characterisation of stable and transient reactive oxygen species formed under radiative and non-radiative conditions

Richards, E. ORCID: https://orcid.org/0000-0001-6691-2377, Murphy, D. M. ORCID: https://orcid.org/0000-0002-5941-4879 and Che, M. 2019. An EPR characterisation of stable and transient reactive oxygen species formed under radiative and non-radiative conditions. Research on Chemical Intermediates 45 (12) , pp. 5763-5779. 10.1007/s11164-019-04001-0

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Abstract

Electron paramagnetic resonance (EPR) spectroscopy is the ideal method of choice when detecting and studying the wide variety of paramagnetic oxygen-centred radicals. For simple diatomic radicals, such as the superoxide (O2−) or peroxy ( ROO ∙ ) (ROO∙) species, the CW EPR profile (in particular the g-values) of these species can appear similar and indeed indistinguishable in some cases. Experiments using 17O-enriched oxygen, revealing a rich 17O hyperfine pattern, are therefore essential to distinguish between the two species. However, in many cases, particularly involving TiO2 photocatalysis, the peroxy-type ( ROO ∙ ) (ROO∙) radicals or other intermediate species such as the [O2−…organic]-type adducts can be transient in nature and once again can produce similar g-values. In general terms, these reactive oxygen species (ROS) are formed and detected at low-temperature conditions. Hence, the application of EPR spectroscopy to studies of surface-stabilised oxygen-centred radicals must be performed under carefully selected conditions in order to confidently distinguish between the differing types of diatomic radicals, such as O2−, ROO ∙ ROO∙ or [O2−…organic].

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry
Publisher:	Springer Verlag (Germany)
ISSN:	0922-6168
Date of First Compliant Deposit:	29 November 2019
Date of Acceptance:	6 September 2019
Last Modified:	05 May 2023 04:29
URI:	https://orca.cardiff.ac.uk/id/eprint/127237

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