Metal Cluster Topology. 2. Gold Clusters.
Abstract
Previously developed methods for the treatment of polyhedral boranes, carbonranes, and metal clusters are extended to the treatment of gold clusters, which present a variety of new problems. In most cases gold atoms in such cluster compounds do not employ the usal 9-oribital sp superscript 3 d superscripts spherical bonding orbital manifold. Instead almost all non-tetrahedral gold clusters consist of a center gold atom surrounded by a puckered polygonal belt of peripheral gold atoms generally with one or more additional peripheral gold atoms in distal positions above and/or below the belt. The peripheral gold atoms in such clusters use a 7-orbital spd superscripts cylindrical bonding orbital manifold, but their residual two orthogonal antibonding p orbtials can receive electron density from the filled d orbitals of adjacent peripheral gold atoms through backbonding leading to bonding distances between adjacent peripeheral gold atoms. Centered gold clusters can be classified into either spherical or toroidal clusters. The topology of the core bonding in gold clusters mimics the toplogy of the polyhedron formed by the surface atoms. Examples of non-centered gold clusters treated in this paper include the squashed pentagonal bipyramidal Au7(PPH3)7+ and the edge-fused bitetrahedral (Ph3P)4Au6Co(CO)42 which may be regarded as a perauraethylene in which the six cluster gold atoms correspond to the six atoms of ethylene including a double bond between the two gold atoms corresponding to the two ethylene carbon atoms.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 29, 1986
- Accession Number
- ADA164395
Entities
People
- R. B. King
Organizations
- University of Georgia