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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Electronic structural trends in divalent carbon compounds.

Han Vinh Huynh1, Gilles Frison

  • 1Department of Chemistry, 3 Science Drive 3, National University of Singapore, Singapore 117543.

The Journal of Organic Chemistry
|December 21, 2012
PubMed
Summary
This summary is machine-generated.

This study analyzes electronic densities in divalent carbon compounds, revealing that π-electron distribution is linked to molecular orbitals, not simple structural rules. This clarifies trends from classical N-heterocyclic carbenes to mesoionic carbenes.

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Published on: October 12, 2019

Area of Science:

  • Organometallic Chemistry
  • Computational Chemistry
  • Materials Science

Background:

  • Divalent carbon-donor compounds, including N-heterocyclic carbenes (NHCs) and mesoionic carbenes, are crucial ligands in catalysis and materials science.
  • Understanding their electronic structure is key to tuning their reactivity and properties.

Purpose of the Study:

  • To analyze and compare intrinsic electronic densities in neutral and anionic divalent carbon-donor derivatives.
  • To identify structural factors influencing the energy of the σ-lone pair (HOMO) and thus σ-basicity.
  • To describe the π-electronic structure and its relationship with π-population and π-molecular orbitals (π-MOs).

Main Methods:

  • Density functional theory (DFT) calculations were employed to investigate electronic densities.
  • Analysis focused on the Highest Occupied Molecular Orbital (HOMO), identified as the σ-lone pair at the divalent carbon.
  • Comparison of π-electronic structures with protonated analogues was performed.

Main Results:

  • No simple structural criteria directly correlate with the π-electronic distribution.
  • The π-population, π-acidity, and π-basicity are intrinsically linked to the π-MOs.
  • Trends in π-population across different divalent carbon species, from NHCs to mesoionic carbenes, were rationalized by analyzing π-MOs.

Conclusions:

  • The electronic structure of divalent carbon derivatives is complex, with π-properties governed by π-MOs rather than straightforward structural correlations.
  • A method for qualitatively predicting π-MOs based on protonated analogues was established.
  • The study provides a rationalization for the continuous range of π-populations observed in these ligands.