Reversible Dissociation of a Dialumene*
Rosalyn L Falconer1, Keelan M Byrne2, Gary S Nichol1
1School of Chemistry, University of Edinburgh, Edinburgh, UK.
Angewandte Chemie (International Ed. in English)
|September 14, 2021
Summary
Researchers isolated a neutral aluminum(I) compound, a dialumene, featuring a unique Al=Al multiple bond. This dialumene exhibits distinct reactivity, acting as either a dialumene or monomeric aluminum(I) species.
Area of Science:
- Organometallic Chemistry
- Inorganic Chemistry
- Main Group Chemistry
Background:
- Dialumenes are neutral compounds featuring Al=Al multiple bonds.
- Understanding the structure and reactivity of low-valent main group elements is crucial.
Purpose of the Study:
- To isolate and characterize a novel amidophosphine-supported dialumene.
- To investigate the bonding, electronic structure, and reactivity of this Al(I) compound.
Main Methods:
- X-ray crystallography for structural determination.
- Spectroscopic analyses (e.g., NMR, IR) for characterization.
- Density Functional Theory (DFT) computations for electronic structure and bonding analysis.
Main Results:
- Isolation of a stable dialumene supported by an amidophosphine ligand.
- Structural analysis revealed a long, trans-bent Al=Al bond with low bond order and dissociation energy.
- In solution, the dialumene can dissociate into monomeric Al(I) species.
- Reactivity studies demonstrated dual behavior: acting as a dialumene or as aluminyl monomers.
Conclusions:
- The study successfully isolated and characterized a unique dialumene.
- The Al=Al bond exhibits unusual characteristics, including significant bending and low stability.
- The dialumene displays versatile reactivity, highlighting the complex chemistry of low-valent aluminum.
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