Electronic structure of clusters

Electron counting rules have been developed to explain the observed geometries of many cluster compounds (see Electronic Structure of Clusters). Interesting, heavy main group element-transition metal complexes tend to violate... 

The polyhedral structures adopted by most metallacarbab-orane compounds can usually be rationalized using polyhedral skeletal electron pair theory (PSEPT) (see Electronic Structure of Clusters). This approach is summarized as follows ... 

Bonding Energetics of OrganometaUic Compounds Electronic Structure of Main-group Compounds Electronic Structure of Solids Electronic Structure of Clusters Ligand Field Theory Spectra Molecular Orbital Theory Photoelectron Spectroscopy of Transition Metal Systems. 

A generalization of the electron counting rules for clusters to accommodate various types of fused cluster structures with common cluster vertices has appeared. The wide variety of examples aheady known illustrates a richness of cluster structure greatly exceeding that of the single cluster (see Electronic Structure of Clusters). Indeed, these ideas provide new insight into the structures of elemental boron in which complex fused cages are observed, and one can see that cluster versions of, for example, metal chains (31), are possible. ... 

Finally, it is an especially great pleasure for me to warmly recommend this book to every reader interested to know more about the electronic structure of clusters and solids, on the occasion of the centennial of the discovery of the electron. 

This field has expanded very rapidly in just the last two years with the development of many new experimental techniques. The excitement continues. The nature of these new experimental probes has and will continue to significantly influence the development of the field. The ability to select a specific size cluster ion and study its properties is an important new tool. Photoelectron spectroscopy will provide new insight about the electronic structure of clusters as a function of cluster size. Magnetic deflection and electronic susceptibility experiments on neutral clusters and cluster adducts will also provide important information. Vibrational spectroscopy using a variety of different... 

Thus the present position seems to be one in which an improved understanding of the electronic structures of clusters awaits both a more sure theoretical foundation and careful experimental work against which the theoretical predictions can be tested. 

Figures 4.3c, d and e illustrate changes in electronic structure of cluster 3a when the cluster atoms become part of a surface. Three physically different situations have to be distinguished surface molecule limit, intermediate adsorption and weak adsorption. Figure 4.3c schematically presents the electronic structure in the surface molecule limit. Then the interaction between adatom and surface atoms P is significantly larger than p ...

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