Abstract

Core and valence spectra have been measured in a series of angle-resolved high-resolution X-ray photoelectron spectroscopic experiments on the molecular metal cluster compounds [Au55(PR3)12Cl6] with R3= Ph2(C6H4SO3Na-m), (C6H4Me-p)3, (C6H4OMe-p)3 or Ph3 which represent all such compounds synthesized to date. Only a limited number of samples satisfies the nominal composition. In some of the samples the presence of gold particles, larger than the nominal Au55 clusters, is observed. Gold monomers bound to P and Cl are shown to be present in a number of samples.

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