Pt NMR Shift and Adsorbates Electronegativity

It is important to point out that the invariance observed here is in quite a different context to that of originally proposed in the Friedel-Heine invariance theorem, which refers to the invariance of electronic properties in bulk environments of dilute alloys. The situation is quite different for nanoscale metal particles from those of bulk Pt, due to the presence of the surface and the significant reductions in the particle volume. However, the Ef-l DOSs still show a remarkable invariance towards changes in surface chemical environment, even though they vary from those of bulk Pt. These results may also be expected to lead to useful general correlations between electronic properties and more conventional chemical descriptions such as ligand electronegativity. 

Moreover, the experimental results can be fit to a simple relationship, which has the essence of a Bardeen-Friedel oscillation,  

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