Additional Comments on Clusters

As we have seen, transition metal clusters can adopt a wide variety of geometries and can involve metal-metal bonds of order as high as 4. Clusters may also include much larger polyhedra than shown so far in this chapter, polyhedra linked through vertices. 

Prakash, R. E. Williams, L. D. Field, and K. Wade, Hypercarbon Chemistry, John Wiley Sons, New York, 1987, pp, 123-133. 

FIGURE 15-24 Examples of Large Clusters. CO and hydride ligands have been omitted to show the metal-metal bonding more clearly. 

FIGURE 15-25 A Hydride Ion in a Cage of Eight Lithium Ions. (Reproduced with permission from D. R. Armstrong, W. Clegg, 

Find organic fragments that are isolobal with 

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