Stable Gold Anions

  • Author: Angewandte Chemie International Edition
  • Published Date: 20 July 2017
  • Source / Publisher: Angewandte Chemie International Edition/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
thumbnail image: Stable Gold Anions

The transition metals are typically regarded as cation-forming elements. However, gold is a notable exception since it is stable as an isolated anion (Au– or auride). In addition to its unusual charge, the auride anion possesses 12 valence electrons, with fully filled 5d and 6s subshells. This unique electronic structure is made possible by the relativistic stabilization of the 6s orbital around the heavy gold nucleus. Although auride salts are known, the coordination chemistry of the auride ion in solution is basically unexplored.


W. Hill Harman, University of California, Riverside, USA, and colleagues have developed a molecular framework capable of stabilizing an auride equivalent. They achieved this by incorporating strong acceptor interactions into a ligand based on diboraanthracene. The primary bonding interaction in the resulting complex (pictured) is a donor–acceptor interaction between the filled 6s orbital on gold and the boron-based p-orbitals.


As gold and hydrogen have an isolobal relationship (i.e., they can bond in a similar way), this compound is analogous to a borohydride and is described as a boroauride. The stabilizing ligand framework means that the auride can be reversibly oxidized to an Au cation, thus giving access to auride redox chemistry in solution.


 

Article Views: 2887

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


Magazine of Chemistry Europe (16 European Chemical Societies)published by Wiley-VCH