Green, Jason, Carter, Emma  ORCID: https://orcid.org/0000-0001-6691-2377 and Murphy, Damien Martin ORCID: https://orcid.org/0000-0002-5941-4879
2009.
An EPR investigation of acetonitrile reactivity with superoxide radicals on polycrystalline TiO2.
Research on Chemical Intermediates
35
(2)
, pp. 145-154.
10.1007/s11164-008-0022-4
|
Abstract
The interaction of acetonitrile with superoxide radicals over a polycrystalline TiO2 (Degussa P25) surface was investigated using continuous-wave electron paramagnetic resonance (cw-EPR) spectroscopy. For the first time, a thermally unstable radical intermediate has been observed following the low-temperature exposure of acetonitrile to surface-adsorbed O2− radicals. The radical intermediate has been identified as an [O2−···CH3CN] type surface complex characterised by the g values of g 1 = 2.031, g 2 = 2.010 and g 3 = 2.003. This surface complex is thermally unstable and decomposes at temperatures of T > 240 K. A second oxygen-centred species was also observed following acetonitrile adsorption, characterised by the spin Hamiltonian parameters of g 1 = 2.028, g 2 = 2.010, g 3 = 2.004, A 1 = 1.2 mT, A 2 = 1.0 mT and A 3 = 1.0 mT, and was assigned to a hydroperoxy radical (HO2•).
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Chemistry |
| Subjects: | Q Science > QD Chemistry |
| Uncontrolled Keywords: | TiO2 - Acetonitrile - Surface oxygen radicals - EPR |
| Publisher: | Springer |
| ISSN: | 0922-6168 |
| Last Modified: | 02 May 2025 15:46 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/5960 |
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