Group-Transition Metal Mixed Clusters

Main Group-Transition Metal Mixed Clusters 

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Current concepts in modem chemistry/Transition metal cluster chemistry/Main group-transition metal mixed clusters/Cluster compounds of main group elements/ Synthetic analogues of the active sites of iron-sulfur proteins... 

Although compounds with edge and face-bridging ligands may be formally considered as main group-transition metal mixed clusters (s. Chap. 3), in these section they will be referred to only as ligands. 

Main Group-Transition Metal Mixed Clusters... 

Table 3.2. Selected examples of main group transition metal mixed clusters with stoichiometries M4E, M5E, and MeE.

Table 3.3. Cluster valence electron counting in main group-transition metal mixed clusters...

The simplest and also the commonest among main group-transition metal mixed compounds are those in which the main group element caps a triangular array of metal atoms in any triangular or more complex deltahedral metal cluster thus forming units of the type (jU3-E)M3. 

Photoelectron spectroscopy has been used to determine the threshold of electron detachment in small cluster anions and in some cases electronic transitions may be observed. The group of Nakajima and co-workers (261-264) studied several metal sulfide cluster anions. Many other systems have been studied by photoelectron spectroscopy including the [LaCJ (265), [AuC6F6] (266), and mixed-metal cluster anions (267). 

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