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Sucface levels and surface properties such as adsorptive and catalytic abilities of alkaline earth metal oxides strongly depend on coordinative unsaturation of intrinsic surface ions. Both theoretical and experimental works reveal the formation of two surface levels due to MgLC2+ and OLC2-, respectively, where LC denotes low coordination, within the bulk band gap. The surface levels originating from OLC2go up with lowering of its coordination number and act as electron donative and basic centers. In many cases adsorptions and catalytic reactions proceed on dual active sites of MgLC2+-OLC2types which can heterolytically dissociate molecules. Another type of adsorption is also possible on the OLC2site which donates its electron to adsorbed molecules with high electron affinity. Cooperative role of MgLC2+ is also necessary in this case. Coordination numbers have been tentatively assigned to these active sites.

Coordinative unsaturation and adsorptive and catalytic activities of alkaline earth metal oxides.