Abstract
195Pt NMR on the organic ligand stabilized metal cluster compound Pt309Phen *36 O30 reveals two separate peaks in the lineshape. Ligand-bonded platinum atoms at the surface of the core are thought to be responsible for the peak that does not show any Knight shift. The corresponding spin-lattice relaxation timeT 1 is of the order of seconds. The second peak is Knight shifted and is attributed to the other Pt atoms, for which metallic behavior is inferred from the temperature dependence ofT 1. The Korringa relation holds down to 65 K. Below 65 K the relaxation of the magnetization becomes increasingly non-exponential with decreasing temperature. The relaxation process can be successfully modelled under the assumption of a Poisson distribution of the energy levels around the Fermi energy (the electronic quantum size effect).
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van der Putten, D., Brom, H.B., Witteveen, J. et al. The electronic quantum size effect observed by195Pt NMR in the metal cluster compound Pt309Phen *36 O30 . Z Phys D - Atoms, Molecules and Clusters 26 (Suppl 1), 21–23 (1993). https://doi.org/10.1007/BF01425605
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DOI: https://doi.org/10.1007/BF01425605