Experimental evidence for the hyperfine interaction between a surface superoxide species on MgO and a neighbouring hydroxylic proton
- 1 January 1989
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 85 (12) , 3987-3994
- https://doi.org/10.1039/f19898503987
Abstract
The superoxide O– 2 radical ion has been generated at the surface of MgO by two different methods both involving the parallel formation of surface hydroxyls. EPR spectra at 77 K reveal the presence of only one species with a hyperfine structure due to weak dipole–dipole interaction with a nearby hydroxyl (Bx= 0.37 mT, By= 0.21 mT, Bz= 0.10 mT). The set of B data is satisfactorily reproduced by a simple model for the dipolar interaction envisaging a T-shaped O– 2⋯H species. Calculated geometrical features are in excellent agreement with a plausible structure for the superoxide species sitting on low-coordinate Mg2+ and interacting with the hydrogen of an adjacent hydroxyl.This publication has 1 reference indexed in Scilit:
- Superoxide ions formed on MgO through the agency of presorbed molecules. Part 1.—Spectroscopic electron spin resonance featuresJournal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, 1989