Homometallic dinuclear complex

The monometallic CBER mechanism [3H]cber occurs when M = M and hence only one metal is present. Figure 7 shows this case. There are two sequences of mononuclear intermediates from the set M and these are distinguished by the use of different shades of blue. One reason for representing these sequences in the same colour arises from the possibility that some of the organometallic intermediates in each sequence are not uniquely present in just one sequence. The sequence consisting of homometallic dinuclear complexes is colour-coded in grey—green. As before, there are two very special reactions a and p, and these transform mononuclear species into homometallic dinuclear complexes and homometallic dinuclear complexes into mononuclear species. 

The application of this strategy to dinuclear complexes is briefly illustrated. If the target is the preparation of a dinuclear homometallic complex, the synthesis is... 

Reactions of clusters with mononuclear or dinuclear metal complexes frequently provide a method of expanding the metal core nuclearity under controlled conditions. The majority of medium- and high-nuclearity homometallic clusters has been prepared from lower-nuclearity cluster precursors by thermolyses ("heat-it-and-hope ) reactions. This is less true of the heterometallic clusters in this... 

Figure 3, Schematic representation of the synthetic strategy used to prepare dinuclear homometallic (a) and dinuclear heterometallic (b) complexes.

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