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What is required to stabilize Al3+? A gas-phase perspective
Ljiljana Puskar1, Katharine Tomlins, Bridgette Duncombe
1Department of Chemistry, University of Sussex, Falmer, Brighton, UK.
Journal of the American Chemical Society
|May 19, 2005
Summary
Aluminum cation (Al(3+)) can be stabilized in gas phase using specific ligands. Acetonitrile forms the most stable complexes, suggesting nitrile compounds may sequester Al(3+) from solutions.
Area of Science:
- Inorganic Chemistry
- Computational Chemistry
- Physical Chemistry
Background:
- Aluminum cation (Al(3+) behavior is typically studied in condensed phases.
- Gas-phase stabilization of Al(3+) presents unique challenges due to its high charge density.
Purpose of the Study:
- To investigate the gas-phase stabilization of the Al(3+) cation.
- To identify ligands capable of stabilizing Al(3+) through sigma donation and acceptance.
- To explore the role of electron acceptance into ligand antibonding orbitals for Al(3+) complexation.
Main Methods:
- Combination of experimental techniques and theoretical calculations.
- Ab initio and Density Functional Theory (DFT) methods were employed.
- Gas-phase complexation studies with various ligands.
Main Results:
- Demonstrated stabilization of Al(3+) in the gas phase using specific ligands.
- Identified ligands acting as potent sigma donors and electron acceptors.
- Acetonitrile identified as forming the most stable Al(3+) complexes in the gas phase.
- Electron acceptance into ligand antibonding orbitals shown to be significant for Al(3+) stabilization.
Conclusions:
- Ligand design principles for stabilizing Al(3+) in the gas phase have been established.
- Acetonitrile's effectiveness supports its use in gas-phase Al(3+) complexation.
- Nitrile-containing compounds (-C≡N group) are proposed as potential sequestering agents for Al(3+) in aqueous solutions.
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