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Related Concept Videos

Carbocations02:10

Carbocations

Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...

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Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus
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Cationic gold carbonyl complex on a phosphine support.

H V Rasika Dias1, Chandrakanta Dash, Muhammed Yousufuddin

  • 1Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019-0065, USA. dias@uta.edu

Inorganic Chemistry
|April 22, 2011
PubMed
Summary

A new cationic gold carbonyl complex, [(Mes(3)P)Au(CO)][SbF(6)], was synthesized and studied. Computational analysis revealed electrostatic attraction and π-back-bonding significantly influence its gold-carbon monoxide bond.

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Published on: July 30, 2017

Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Computational Chemistry

Background:

  • Cationic gold complexes are of interest due to their unique bonding characteristics.
  • Understanding the nature of metal-carbonyl bonds is crucial in catalysis and coordination chemistry.

Purpose of the Study:

  • To synthesize and characterize a novel cationic gold carbonyl complex.
  • To investigate the electronic structure and bonding in the gold-carbon monoxide interaction.
  • To elucidate the factors contributing to the observed spectroscopic properties.

Main Methods:

  • Synthesis of [(Mes(3)P)Au(CO)][SbF(6)] complex.
  • Characterization using X-ray crystallography and spectroscopic techniques (IR, NMR).
  • Density Functional Theory (DFT) computational studies.

Main Results:

  • The complex features a linear, two-coordinate gold atom.
  • Observed CO stretching frequency at 2185 cm⁻¹ and a ¹³C NMR signal at δ 182.6 ppm.
  • Computational analysis indicated a bonding model involving electrostatic attraction, Au ← CO donation, and Au → CO π-back-bonding.

Conclusions:

  • The cationic gold center significantly polarizes the CO ligand.
  • This polarization, combined with π-back-bonding, explains the observed high CO stretching frequency.
  • The study provides insights into the bonding of cationic gold carbonyls.