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Related Experiment Videos

Structure of AuCN determined from total neutron diffraction.

Simon J Hibble1, Alex C Hannon, Simon M Cheyne

  • 1School of Chemistry, University of Reading, Reading RG6 6AD, UK. s.j.hibble@rdg.ac.uk

Inorganic Chemistry
|July 23, 2003
PubMed
Summary

The structure of gold cyanide (AuCN) reveals identical Au-C and Au-N bonds, differing from previous findings. This study explains AuCN

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Crystallography

Background:

  • Gold cyanide (AuCN) exhibits complex structural properties.
  • Previous studies using limited diffraction data suggested differing Au-C and Au-N bond lengths.

Purpose of the Study:

  • To accurately determine the crystal structure of gold cyanide (AuCN) at low (10 K) and ambient (300 K) temperatures.
  • To resolve discrepancies in previously reported Au-C and Au-N bond lengths.

Main Methods:

  • Total neutron diffraction was employed to analyze the AuCN structure.
  • Modeling of the total correlation function, T(r), was performed using diffraction data.

Main Results:

  • Identical Au-C and Au-N bond lengths (1.9703(5) Å at 300 K) were confirmed, contradicting prior research.
  • Significant differences in inter- and intrachain correlation broadening were observed due to chain displacements.
  • An explanation for negative thermal expansion along the c-direction was provided.

Conclusions:

  • The hexagonal packing of infinite [Au(CN)] chains in AuCN is definitively established.
  • Weak interchain bonding explains observed anisotropic thermal expansion.
  • This work provides a more accurate structural model for gold cyanide.

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