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Synthesis of square-planar aluminum(III) complexes
Emily J Thompson1, Thomas W Myers, Louise A Berben
1Department of Chemistry, University of California, 1 Shields Ave, Davis, CA 95616 (USA).
Angewandte Chemie (International Ed. in English)
|October 17, 2014
Summary
Researchers synthesized novel square-planar aluminum(III) complexes using a reduced bis(imino)pyridine ligand. These four-coordinate aluminum complexes exhibit Lewis acidity and bind to 2,6-lutidine.
Area of Science:
- Organometallic Chemistry
- Inorganic Chemistry
Background:
- Aluminum(III) complexes are crucial in catalysis and materials science.
- Exploring novel coordination geometries for aluminum is key to understanding its reactivity.
Purpose of the Study:
- To synthesize and characterize new four-coordinate, square-planar aluminum(III) complexes.
- To investigate the structural and electronic properties of these novel complexes.
Main Methods:
- Reaction of a reduced phenyl-substituted bis(imino)pyridine ligand (Na2((Ph)I2P(2-))) with aluminum chloride (AlCl3).
- Isolation and purification of aluminum complexes using different solvent systems (THF, diethyl ether, benzene).
- Structural characterization using X-ray crystallography and geometric index (τ4).
Main Results:
- Synthesis of five-coordinate [((Ph)I2P(2-))Al(THF)Cl] (1).
- Formation of square-planar aluminum complexes [((Ph)I2P(2-))AlCl] (2) and [((Ph)I2P(2-))AlH] (3).
- Geometric index (τ4) confirmed square-planar geometry for complexes 2 (0.22) and 3 (0.13).
- Both complexes 2 and 3 demonstrated Lewis acidity, binding 2,6-lutidine.
Conclusions:
- Successfully synthesized unprecedented four-coordinate, square-planar aluminum(III) complexes.
- The synthesized complexes exhibit Lewis acidity, indicating potential applications in catalysis.
- The study expands the known coordination chemistry of aluminum.
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