Structural and Reactivity Aspects of Hetero-Pt Clusters

It is convenient to discuss the structures and chemical reactivity of hetero-Pt clusters under the individual metals, because there is little homogeneity of structural type, particularly when the details of ligand coordination are taken into account. There are remarkably few examples common to more than one 

In the case of (1), even the details of ligand coordination vary, because the Fe cluster has a structure with all terminal carbonyls, whereas the iso-structural Ru and Os cogenors have three bridging carbonyls and a different phosphine distribution (Fig. 11). Important metrical details for all the crys-tallographically characterized Fe-Pt, Ru-Pt, Os-Pt, Co-Pt, Rh-Pt, and Ir-Pt clusters are given in Tables III—VIII respectively. Due to the paucity of examples, crystallographically characterized Ni-Pt and Pd - Pt clusters are not tabulated separately but are discussed in the individual sections, as are clusters containing more than two different metals. 

The earliest examples were provided by the work of Stone et al. on reactions of zero-valent Pt complexes with carbonyls of the iron triad (10,36,37). Thus 

Fe3Pt(/i4.-C=C(H)PhXCO)9(dppe) 60 Butterfly No metrical details available 143 

In angstroms estimated standard deviations in parentheses. Mean Fe-Pt = 

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