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Titanium-Thiolate-Aluminum-Carbide Complexes by Multiple C-H Bond Activation.
1School of Physical Sciences, Chemistry and Biochemistry, University of Windsor, Ontario, N9P 3P4 (Canada).
Angewandte Chemie (International Ed. in English)
|January 29, 2000
Summary
Titanium-aluminum-carbide clusters were synthesized by activating all C-H bonds in a methyl group. This reaction resulted in a distorted carbide carbon atom bonded to titanium, influenced by Lewis acidity.
Area of Science:
- Organometallic chemistry
- Coordination chemistry
- Materials science
Background:
- Methyl group C-H bond activation is crucial for organic synthesis.
- Titanium complexes are versatile catalysts in various chemical transformations.
- Understanding metal-carbide cluster formation provides insights into new materials.
Purpose of the Study:
- To investigate the reaction of a specific titanium complex with trimethylaluminum.
- To characterize the structure and bonding of the resulting titanium-aluminum-carbide clusters.
- To explore the factors influencing the electronic properties of the carbide carbon atom.
Main Methods:
- Reaction of [Cp(iPr(3)PN)Ti(SR)(2)] with AlMe(3).
- Structural characterization of the Ti-Al-carbide clusters using X-ray diffraction.
- Analysis of bonding interactions and electronic properties.
Main Results:
- Complete activation of all three C-H bonds of the methyl group was achieved.
- Formation of Ti-Al-carbide clusters containing a severely distorted tetrahedral carbide carbon atom.
- A short Ti-C bond was observed, attributed to increased Lewis acidity of the titanium center due to S and N donor interactions with aluminum.
Conclusions:
- The reaction provides a novel route to titanium-aluminum-carbide clusters.
- The electronic properties of the carbide carbon are significantly influenced by the surrounding metal centers and ligands.
- This study highlights the role of Lewis acidity in C-H activation and cluster formation.