Carbon's Three-Center, Four-Electron Tetrel Bond, Treated Experimentally
Alavi Karim1, Nils Schulz2, Hanna Andersson1,3
1Department of Chemistry and Molecular Biology , University of Gothenburg , SE-412 96 Gothenburg , Sweden.
Journal of the American Chemical Society
|November 29, 2018
Summary
Researchers experimentally confirmed the strongest tetrel bond yet, a carbon-centered interaction involving a carbenium ion and a bidentate Lewis base. This discovery offers a new model for studying chemical bonding and reaction mechanisms.
Area of Science:
- Chemical bonding
- Noncovalent interactions
- Supramolecular chemistry
Background:
- Tetrel bonding involves group IV elements interacting with electron donors.
- It is a directional interaction, similar to hydrogen and halogen bonding, but less explored.
- Understanding tetrel bonds is crucial for advancing chemical bonding theories.
Purpose of the Study:
- To experimentally investigate a novel carbon-centered tetrel bond, [N-C-N]+.
- To characterize the structure and stability of this tetrel bond complex.
- To compare this tetrel bond with analogous halogen bonds and explore factors influencing its formation.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy
- Titration calorimetry
- Reaction kinetics studies
- Crystallography
Main Results:
- Experimental evidence for the existence and structure of the [N-C-N]+ tetrel bond was obtained.
- This represents the strongest tetrel bond reported to date.
- Bidentate Lewis bases stabilize the tetrel bond, while monodentate bases induce reactions.
Conclusions:
- The study confirms a strong, experimentally validated carbon-centered tetrel bond.
- The findings highlight the importance of Lewis base denticity in stabilizing tetrel bonds.
- The observed complex geometry serves as a model for SN2 transition states, aiding reaction mechanism studies.
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