Metal Cluster Topology. 4. Rhodium Carbonyl Clusters Having Fused Polyhedra.
GEORGIA UNIV ATHENS DEPT OF CHEMISTRY
Pagination or Media Count:
Previously discussed topological models of metal cluster bonding are now extended to the treatment of anionic rhodium carbonyl clusters having structures consisting of fused polyhedra. Examples of such rhodium carbonyl clusters built from fused octahedra include the biphenyl analogue Rh12CO30-2, the face-sharing naphthalene analogue Rh9CO193-, and the perinaphthene analogue, Rh11CO233-. More complicated anionic rhodium carbonyl clusters treated in this paer include the Rh13CO24H5-qq- anions q 2,3,4 having an Rh13 centered cuboctahedron, the Rh14CO25H4-qq- q 3,4 and Rh14CO262- anions based on a centered pentacapped cube, the Rh15CO303- anion having an Rh15 centered 14-vertex deltahedron, the Rh15CO273- anion having a tricapped centered 11-vertex polyhedron, the Rh17CO303- anion having a tetracapped centered cuboctahedron, and the Rh22CO374- anion having a hexacapped centered cuboctahedron fused to an octahedron so that the octahedron and the cuboctahedron share a triangular face. Analyses of the bonding topologies in Rh9CO193-, Rh17CO303-, and Rh22CO374- indicate that a polyhedral network containing several fused globally delocalized polyhedral chambers will not necessarily have a multicenter core bond in the center of each such polyhedral chamber. This observation is of potential importance in extending topological models of metal cluster bonding to bulk metals.
- Organic Chemistry