Ag_(13)OsO_6: A Silver Oxide with Interconnected Icosahedral Ag_(13)~(4+) Clusters and Dispersed [OsO_6]~(4-) Octahedra

摘要

It has become possible to synthesize ternary silver oxides routinely by reacting the appropriate binary oxides in the solid state under oxygen pressure. Recent systematic investigation shave revealed that early, rare observations of unusually short silver-silver separations in oxides were not exceptions, but manifestations of a general feature of the chemistry of silver. From our broad basis of experimental data the following picture now emerges: In oxides with high smiler contents, silver atoms tend to cluster forming partial structures that are topologically reminiscent of elemental silver. These structures seem to be associated with specific physical properties. Weak Ag~+-Ag~+ bonding therefore seems to exist, which indicates that monovalent silver (d~(10) configuration) can no longer be regarded as a closed-shell ion.