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An EXAFS study of some gold and palladium cluster compounds

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Zeitschrift für Physik D Atoms, Molecules and Clusters

Abstract

Gold L3-edge EXAFS measurements at 80 K on Au55(PPh3)12Cl6 confirm that the Au-Au distances in this amorphous metal cluster compound are significantly shorter than in bulk gold. The nearest-neighbour Au-Au distances are all equal within experimental uncertainty. Outer-shell Au-Au distances have also been resolved. The results are consistent with the cuboctahedral structure originally proposed for this cluster, but not the polyicosahedral one recently suggested. Very similar results have been obtained from the sulphonated water-soluble derivative Au55(PPh2C6H4SO3Na)12Cl6. In contrast, EXAFS of Au11{PPh2(p-ClC6H4)}7I3 has clearly resolved the two nearest-neighbour Au-Au distances associated with its icosahedral structure.

Palladium K-edge EXAFS has been used to study the cluster Pd561(phen)36O200. The Pd-Pd distance is nearly equal to that in bulk palladium. The results show a cubic close-packed cluster structure for this material, in contrast to the icosahedral structure reported for Pd561(phen)60(OAc)180.

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Authors and Affiliations

  1. Physics Laboratory, University of Kent at Canterbury, CT2 7NR, Kent, UK

    Paul D. Cluskey & Robert J. Newport

  2. Chemical Laboratory, University of Kent at Canterbury, CT2 7NH, Kent, UK

    Robert E. Benfield

  3. Physics Department, University of Leicester, LE1 7RH, Leicester, UK

    Stephen J. Gurman

  4. Institüt für Anorganische Chemie, Universitätsstr. 5-7, W-4300, Essen 1, Germany

    Günter Schmid

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  1. Paul D. Cluskey
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  2. Robert J. Newport
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  3. Robert E. Benfield
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  4. Stephen J. Gurman
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  5. Günter Schmid
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Cluskey, P.D., Newport, R.J., Benfield, R.E. et al. An EXAFS study of some gold and palladium cluster compounds. Z Phys D - Atoms, Molecules and Clusters 26 (Suppl 1), 8–11 (1993). https://doi.org/10.1007/BF01425601

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