Metallic nuclei in clusters

Nowadays the NMR of metals is widely used [1-7]. This review is devoted specifically to the NMR of metal nuclei in clusters, species where at least three metallic atoms are directly bound. Discussion of the NMR of nuclei in ligands directly bound to the metal such as C, etc. is not the subject of this chapter and will be mentioned only where suitable. 

Again, only few results are related to relaxation of metal nuclei in clusters. T values have been reported only for Co [21,28] and range between 1 ms and 50 ps. Linewidths, directly related to the spin-spin relaxation, are sometimes given for quadrupolar nuclei Co [29-31], Cu [32], Mo [33,34]. Relaxation times have been used for structural determination [21] or for the investigation of the dynamic behaviour of clusters [28] no special use of the linewidth is reported, however. 

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