An EXAFS Study Of The Cluster Molecule Au55(PPh3)12Cl6

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Fairbanks, Mary C. ; Benfield, Robert E. ; Newport, Robert J. ; Schmid, Gunter (1990)

Gold L3 edge EXAFS has been used to study the coordination environment of gold atoms in the cluster molecule Au55(PPh3)12Cl6. The mean coordination of 7 by other gold atoms is consistent with a 3-shell cuboctahedral structure for the Au55 cluster. The first direct measurement of the Au-Au distance in this cluster shows that the spacing is significantly shorter than that in bulk metallic gold and is consistent with calorimetric work which has shown the Au-Au interactions are stronger in the cluster than in bulk gold. There is no evidence to suggest a significant spread of Au-Au distances in Au55(PPh3)12Cl6, in contrast to lower-nuclearity gold cluster molecules which have peripheral Au-Au distances typically 0.2Å longer than those to interstitial gold atoms.
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