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A dicoordinate gold(I)-ethylene complex.

Miquel Navarro1, Juan Miranda-Pizarro1, Juan J Moreno1

  • 1Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Consejo Superior de Investigaciones Científicas (CSIC) and University of Sevilla, Sevilla 41092, Spain. jesus.campos@iiq.csic.es.

Chemical Communications (Cambridge, England)
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Researchers isolated the first dicoordinate gold(I)-ethylene compound using a bulky phosphine ligand. Density Functional Theory (DFT) calculations revealed a minor role for π-backdonation in its bonding.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Computational Chemistry

Background:

  • Gold(I) complexes are crucial in catalysis and synthesis.
  • Dicoordinate gold(I) species are less understood than their tricoordinate counterparts.
  • Characterization of novel gold coordination states is fundamental to organometallic chemistry.

Purpose of the Study:

  • To synthesize and fully characterize the first dicoordinate gold(I)-ethylene adduct.
  • To investigate the electronic structure and bonding in this unique gold complex.
  • To compare the bonding characteristics with known tricoordinate gold(I) systems.

Main Methods:

  • Synthesis of a gold(I) complex employing the bulky tris-2-(4,4'-di-tert-butylbiphenylyl)phosphine ligand.
  • Isolation and complete structural characterization of the resulting dicoordinate gold(I)-ethylene adduct.
  • Density Functional Theory (DFT) calculations to analyze the electronic bonding situation.

Main Results:

  • Successful isolation and characterization of the first dicoordinate gold(I)-ethylene species.
  • DFT analysis indicates that π-backdonation plays a significantly smaller role in this dicoordinate complex compared to tricoordinate analogues.
  • The bulky ligand is key to stabilizing the low-coordinate gold center.

Conclusions:

  • The study reports a fundamental dicoordinate gold(I)-ethylene adduct, a previously missing piece in gold organometallic chemistry.
  • The bonding in this species is distinct from tricoordinate gold complexes, with reduced π-backdonation.
  • This work opens avenues for exploring new low-coordinate gold chemistry and its applications.