摘要：

The electronic and structural features of triangular platinum clusters have been analysed by Extended Hückel molecular orbital calculations. The prevalence of planar triangular clusters with a 42 electron count is rationalised, and the way in which the cluster bonding orbitals are markedly stabilised by edge-bridging ligands is discussed in terms of a general model. In such such clusters, the metal p orbitals play a minor role, but the calculations indicate how incorporation of out of plane capping carbonyl ligands induces a greater role for these p orbitals and facilitates the formation of clusters with electron counts of between 42 and 48. The calculations lead to a rationalisation of the way in which the synergism between ligand orbitals on opposite sides of the metal triangle determines the detailed structural features observed in a series of clusters based on the [Pt 3(dppm) 3] core, recently reported by Puddephatt.

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