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Coordination chemistry of amine bis(phenolate) titanium complexes: tuning complex type and structure by ligand
E Y Tshuva1, I Goldberg, M Kol
1Department of Chemistry, Bar-Ilan University, Ramat-Gan, 52900, Israel.
Inorganic Chemistry
|August 7, 2001
Summary
Steric effects influence titanium(IV) complex formation with amine bis(phenolate) ligands. Ligand structure dictates whether octahedral or pentacoordinate complexes form, impacting synthesis of novel titanium compounds.
Area of Science:
- Coordination Chemistry
- Organometallic Chemistry
Background:
- Titanium(IV) complexes are vital in catalysis and materials science.
- Amine bis(phenolate) ligands offer tunable steric and electronic properties.
Purpose of the Study:
- To investigate the impact of ligand structure on titanium(IV) complex formation.
- To explore the role of steric effects in controlling coordination geometry.
Main Methods:
- Synthesis of titanium(IV) complexes with tridentate [ONO]- and tetradentate [ONNO]-type ligands.
- Spectroscopic and structural analysis of synthesized complexes.
- Reaction of titanium tetra(isopropoxide) with various ligand precursors.
Main Results:
- [ONNO]-type ligands consistently formed octahedral complexes, irrespective of steric bulk.
- [ONO]-type ligands showed steric dependence: less bulky ligands yielded octahedral complexes, while bulkier ones formed pentacoordinate complexes.
- Pentacoordinate complexes reacted readily to form bis(heteroleptic) complexes.
Conclusions:
- Ligand design, particularly steric hindrance, is crucial for controlling titanium(IV) coordination geometry.
- The study provides insights into the synthesis of diverse titanium complexes for potential applications.