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Spodium bonding in bis(alkynyl)mecurials.

Chee S Onn1, Anthony F Hill1, Jas S Ward1,2

  • 1Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory, ACT 2601, Australia. a.hill@anu.edu.au.

Chemical Communications (Cambridge, England)
|February 12, 2024
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A novel mercury compound, bis(alkynyl)mercurial, forms adducts with fluoride and phenanthroline. These structures reveal insights into two-coordinate mercury and spodium bonding interactions.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Inorganic Chemistry

Background:

  • Bis(alkynyl)mercurials are a class of organometallic compounds.
  • Understanding mercury's coordination behavior is crucial in inorganic chemistry.

Purpose of the Study:

  • To synthesize and characterize a new bis(alkynyl)mercurial complex.
  • To investigate the coordination behavior of two-coordinate mercury.
  • To explore novel bonding interactions, specifically spodium bonding.

Main Methods:

  • Synthesis of the novel mercury complex Hg{C ue002CSeC ue002W(CO)2(Tp*)}2.
  • Formation and structural characterization of adducts with fluoride and phenanthroline using X-ray crystallography.
  • Analysis of the electronic structure and bonding in the adducts.

Main Results:

  • The successful synthesis of the bis(alkynyl)mercurial Hg{C ue002CSeC ue002W(CO)2(Tp*)}2.
  • Formation of stable adducts with fluoride and phenanthroline.
  • Structural elucidation revealing two-coordinate mercury centers within the adducts.
  • Interpretation of the mercury's electronic environment as a σ-toroid facilitating spodium bonding.

Conclusions:

  • The new bis(alkynyl)mercurial complex exhibits unique coordination properties.
  • Two-coordinate mercury can participate in significant non-covalent interactions, termed spodium bonding.
  • The observed σ-toroid structure is key to understanding this novel bonding mode.