“…In this case the active sites would be coordinatively unsaturated O À oxygen sites that form a methoxy and a hydroxyl species [22]. In case of heterolytic dissociation the methyl is likely to undergo oxygen insertion or migration to a coordinatively unsaturated lattice oxygen to form a methoxy group [23,24]. In that context it is important to note that yttria/zirconia mixed oxides are known to have a defect structure that is dominated by oxygen vacancies, which allows a relatively high mobility of the oxygen anions [25±28].…”
“…In this case the active sites would be coordinatively unsaturated O À oxygen sites that form a methoxy and a hydroxyl species [22]. In case of heterolytic dissociation the methyl is likely to undergo oxygen insertion or migration to a coordinatively unsaturated lattice oxygen to form a methoxy group [23,24]. In that context it is important to note that yttria/zirconia mixed oxides are known to have a defect structure that is dominated by oxygen vacancies, which allows a relatively high mobility of the oxygen anions [25±28].…”
“…These results prompted us to examine CO as an adsorbate, since it is known that a variety of telomeric reduced species are formed on MgO. − Herein we show that the F s + site is not the electron-donating site but that its presence has a great influence on other electron donor sites. 1 Change of the ESR signal of (CO) n x - radicals on Na/MgO.…”
The electron-donating property of Na metal-doped MgO (Na/MgO) was studied by the ESR technique. The spin concentration of (CO)n x-((CO)2 -and/or (CO)6 3-) radicals formed from adsorbed CO on a Na/MgO surface was much higher than that of the surface paramagnetic center formed by an electron released from sodium metal and trapped in an anion vacancy. The ESR signal intensity of the trapped electron paramagnetic center was not changed by the CO adsorption treatment, and so the trapped electron was not transferred to the adsorbate. However, the surface one-electron-donating property was increased dramatically by the trapped electron, apparently due to an inductive effect.
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