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OH–D 2 (OD–H 2 ) isotopic exchange at the surface of CaO monitored by electron paramagnetic resonance
Author(s) -
Pescarmona Paolo,
Chiesa Mario,
Paganini Maria Cristina,
Giamello Elio
Publication year - 2000
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/1097-458x(200010)38:10<833::aid-mrc742>3.0.co;2-d
Subject(s) - chemistry , paramagnetism , electron paramagnetic resonance , adsorption , hydrogen , ion , electron exchange , electron , ion exchange , nuclear magnetic resonance , inorganic chemistry , analytical chemistry (journal) , condensed matter physics , organic chemistry , physics , quantum mechanics
Electron paramagnetic resonance was employed to follow the isotopic exchange reaction$$ \hbox{H}_{\rm 2(g)} + \hbox{OD}^{-}_{\rm (surf)} \rightarrow \hbox{HD}_{\rm (g)} + \hbox{OH}^{-}_{\rm (surf)} $$between gaseous hydrogen and surface deuteroxyl groups at the surface of CaO. This was possible because of the superhyperfine interaction between the H (D) nucleus of surface OH (OD) group and a nearby paramagnetic centre constituted, in one case, by a surface trapped single electron and, in a second case, by a surface‐adsorbed superoxide ion. Copyright © 2000 John Wiley & Sons, Ltd.