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Structural Analysis of Gold Clusters Using Exafs

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Abstract

Three gold clusters, Au55 (PPh3 )12Cl6, Au55h2(C6H4SO3Na)12Cl6 and Au11h2(p–ClC6H4)7I3 (which we shall denote Au55, Au55, and Au11 for convenience) have been studied using EXAFS. Average near-neighbour bond lengths are contracted from the bulk by approximately 0.15Å (±0.02Å) for Au55, and 0.22Å (± 0.02Å) for Au11. Ligand contributions have been successfully modelled in the fitting. Debye-Waller factors for samples at room temperature and at 80K are compared to ascertain the relative degrees of thermal and static disorder present in the systems. Results clearly indicate that static structural disorder predominates over thermally induced vibrational disorder.

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Acknowledgement

We wish to thank R.Bilsborrow for his help in undertaking the EXAFS experiments, and to acknowledge the SERC and the University of Kent at Canterbury for their financial support.

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Authors and Affiliations

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

    P. D. Cluskey & R. J. Newport

  2. Chemistry Dept., University of Kent at Canterbury, Kent, CT2 7NH, UK

    R. E. Benfield

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

    S. J. Gurman

  4. Institut fur Anorganische Chemie der Universitat Essen, Universitatsstr. 5-7, D-4300, Essen 1, Germany

    G. Schmid

Authors
  1. P. D. Cluskey
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  2. R. J. Newport
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  3. R. E. Benfield
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  4. S. J. Gurman
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  5. G. Schmid
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Cluskey, P.D., Newport, R.J., Benfield, R.E. et al. Structural Analysis of Gold Clusters Using Exafs. MRS Online Proceedings Library 272, 289–294 (1992). https://doi.org/10.1557/PROC-272-289

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  • DOI: https://doi.org/10.1557/PROC-272-289

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