Small gold clusters [mean diameter (d)≲ 1.4 nm], unlike larger clusters, show a higher Au(4f) binding energy relative to the bulk value and the presence of a conductance gap in tunnelling measurements, just as the molecular cluster compound, Au55(PPh3)12Cl6; small platinum clusters show similar nonmetallic features.
G. U. Kulkarni, H. N. Aiyer, V. Vijayakrishnan, T. Arunarkavalli and C. N. R. Rao, J. Chem. Soc., Chem. Commun., 1993, 1545 DOI: 10.1039/C39930001545
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