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Structure and dimensions of gold clusters in cucurbit[n]uril (CB[n], n = 6, 7) cavities

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Abstract

The AuL 3 XAFS spectra of gold nanoparticles in cavities of cucurbit[6,7]uril are measured. Gold clusters are found to be characterized by smaller (by 0.03 Å) interatomic distances and a considerable reduction in the Au–Au coordination numbers (N Au–Au ≤ 6) as compared with bulk gold. For all samples, the size distribution of Au nanoparticles is established to have two maxima corresponding to Au in the cavities of cucurbituril molecules with sizes of D(Au) ≤ 1 nm and to macroaggregates of gold. A threefold increase in the Debye–Waller factor at 12 K for nanoparticles in comparison with the bulk metal and a corresponding increase in structural disorder are found. Special physical and chemical properties of small gold particles are dictated by structural disorder, deformations, and stresses increasing with a decrease in size. No visible differences in the Au electronic states upon the transition from bulk to nanoparticles are detected.

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Authors and Affiliations

  1. Nikolaev Institute of Inorganic Chemistry, Russian Academy of Sciences, Novosibirsk, 630090, Russia

    S. B. Erenburg, S. V. Trubina, E. A. Kovalenko & O. A. Gerasko

  2. Boreskov Institute of Catalysis, Russian Academy of Sciences, Novosibirsk, 630090, Russia

    V. I. Zaikovskii

  3. Novosibirsk State University, Novosibirsk, 630090, Russia

    V. I. Zaikovskii & D. K. Toporkov

  4. Budker Institute of Nuclear Physics, Russian Academy of Sciences, Novosibirsk, 630090, Russia

    D. K. Toporkov

  5. ESRF, Grenoble, 38043, France

    K. O. Kvashnina & S. G. Nikitenko

Authors
  1. S. B. Erenburg
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  2. S. V. Trubina
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  3. E. A. Kovalenko
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  4. O. A. Gerasko
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  5. V. I. Zaikovskii
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  6. D. K. Toporkov
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  7. K. O. Kvashnina
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  8. S. G. Nikitenko
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Correspondence to S. B. Erenburg.

Additional information

Original Russian Text © S.B. Erenburg, S.V. Trubina, E.A. Kovalenko, O.A. Gerasko, V.I. Zaikovskii, D.K. Toporkov, K.O. Kvashnina, S.G. Nikitenko, 2015, published in Poverkhnost’. Rentgenovskie, Sinkhrotronnye i Neitronnye Issledovaniya, 2015, No. 10, pp. 45–52.

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Erenburg, S.B., Trubina, S.V., Kovalenko, E.A. et al. Structure and dimensions of gold clusters in cucurbit[n]uril (CB[n], n = 6, 7) cavities. J. Surf. Investig. 9, 1031–1038 (2015). https://doi.org/10.1134/S1027451015050262

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  • DOI: https://doi.org/10.1134/S1027451015050262

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