Dinuclear dialkoxo-bridged cyclopentadienylsiloxo titanium complexes

Area of Science:

• Organometallic Chemistry
• Coordination Chemistry
• Materials Science

Background:

• Dinuclear titanium complexes with bridging ligands are of interest for their unique structural and catalytic properties.
• The synthesis and reactivity of such complexes can lead to novel materials and chemical transformations.

Purpose of the Study:

• To synthesize and characterize novel dinuclear dialkoxo-bridged titanium complexes.
• To investigate the reactivity of these complexes with various reagents, including alkylating agents and Lewis acids.
• To explore the catalytic activity of the synthesized titanium complexes in polymerization reactions.

Main Methods:

• Synthesis of dinuclear dialkoxo-bridged titanium complexes via reactions with dilithium salts or diols.
• Alkylation and alkoxylation reactions to modify the titanium centers.
• Reactions with Lewis acids (e.g., Al(C6F5)3) to study ligand elimination and adduct formation.
• Characterization using NMR spectroscopy, mass spectrometry, and X-ray diffraction.
• Investigation of catalytic activity in epsilon-caprolactone polymerization.

Main Results:

• Successfully synthesized a series of dinuclear dialkoxo-bridged titanium complexes with varying dialkoxo ligands and alkyl/alkoxo substituents.
• Demonstrated the reactivity of these complexes towards alkylation, alkoxylation, and Lewis acid-mediated transformations, yielding diverse titanium species.
• Identified one tetraalkoxo titanium compound capable of catalyzing the polymerization of epsilon-caprolactone.

Conclusions:

• The study presents a versatile synthetic route to novel dinuclear dialkoxo-bridged titanium complexes.
• The reactivity studies reveal the potential for further functionalization and transformation of these titanium frameworks.
• The observed catalytic activity in epsilon-caprolactone polymerization highlights the potential of these complexes in polymer synthesis.