Gold cluster complexes mixed metal

SYNTHESIS OF GOLD-CONTAINING MIXED-METAL CLUSTER COMPLEXES... 

Synthesis of Gold-containing Mixed-metal Cluster Complexes 325... 

The synthetic methods used involve reaction of a cluster anion with [AuCIL], elimination of methane between a cluster hydride and [AuMeL] or addition of LAu+ units to metal-metal bonds. The emphasis here will be on structure and reactions of the complexes. Some examples of mixed gold clusters are given in Table 15, where it can be seen that most work has been on derivatives of clusters of iron, ruthenium and osmium. 

Taking advantage of both aurophilicity and argentophilicity, tetranuclear mixed-metal complexes which contain pairs of Au and Ag atoms have been prepared, as shown in Fig. 19.6.3. In the preparation of mixed gold/silver polynuclear complexes, aurophilicity and argentophilicity have been utilized to promote cluster formation. Figure 19.6.4 shows the cores of several mixed gold-silver clusters. 

There are two examples of the synthesis of mixed-metal gold clusters by treating cationic complexes with [Au(PPh3)]+ [Eqs. (52) and (53)] (88,89). 

L. Pignolet, in Catalysis by Di- and Polynuclear Metal Cluster Complexes Catalysis by Mixed-Metal Clusters Containing Gold Phosphine Groupings, (Eds, R. D, Adams, F, A, Cotton), Wiley-VCH, New-York, 1998, pp. 95. 

Another area of major interest in the field is that of mixed metal cluster systems. Hieber very early in the study of metal carbonyl chemistry was able to prepare mercury complexes of the type Fe(CO)4(HgCl)2. The related gold ° compounds were prepared in the 1960s by reaction of phosphine gold halides with carbonyl anions. 

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