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Updated: Jun 26, 2026

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides
Published on: May 26, 2019
Multiple bonding in the chromium dimer supported by two diazadiene ligands
1Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, USA. d.dupre@louisville.edu
The study reveals the chromium dimer with diazadiene ligands has a bonding degree of 3.6, less than a quadruple bond. Weak dative bonds and charge concentration avoidance explain the metal-ligand complex structure.
Area of Science:
- Inorganic Chemistry
- Computational Chemistry
- Quantum Chemistry
Background:
- Chromium dimers are of interest for their unique bonding characteristics.
- Diazadiene ligands are known to stabilize metal complexes.
Purpose of the Study:
- To analyze the bonding topology and electron density delocalization in a chromium dimer supported by diazadiene ligands.
- To determine the degree of bonding and the nature of metal-ligand interactions.
Main Methods:
- Utilized the Quantum Theory of Atoms in Molecules (QTAIM) for electron density analysis.
- Examined the charge density distribution and topological properties.
Main Results:
- The Cr(2) dimer with two diazadiene ligands exhibits a bonding degree of 3.6, falling short of a formal quadruple bond.
- The metal-ligand complex is stabilized by relatively weak dative bonds.
- Nitrogen lone-pair-like charge concentrations are oriented to minimize repulsion with chromium's inner-valence shell charge concentrations.
Conclusions:
- The bonding in this chromium dimer is complex, influenced by ligand interactions.
- QTAIM provides valuable insights into the nature of metal-metal and metal-ligand bonds.
- Ligand orientation plays a crucial role in stabilizing the electronic structure of the complex.
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