Physical Properties of High-Nuclearity Metal Cluster Compounds
Polynuclear metal cluster compounds provide an interesting class of model systems for small metal particles with chemisorbed molecules. They are composed of large macromolecules consisting of a metal core of a certain number (n) of metal atoms, to which core a “shell” of ligands is coordinated. In fig. 1 the carbonyl cluster [Ni38Pt6(CO)48H]5- is shown as an example. In going from compound to compound the type of metal atom can be varied, as well as the number n of atoms in the metal core. For Au, Pt, Ru and Rh, the maximum value of n reached at this moment is already n = 55, namely in A;u55(PPh3)12Cl6 (fig. 2) and related Pt, Ru and Rh cluster compounds. For Pd a metal core as large as n = 570 has recently been reported3. The advantages of these materials for fundamental research in small metal particle physics are clearly: (i) complete homogeneity of the metal cluster size in each sample; (ii) possibility to study the properties as a function of cluster size by comparing compounds with different n; (iii) availability of macroscopically large (0,01 – 10 g) samples for a variety of physical experiments.
KeywordsMetal Cluster Metal Core AU55 Cluster Cluster Compound Carbonyl Cluster
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