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High-Valent Nickel Complexes Supported by a Functionalized PC(sp3)P Pincer Ligand: Properties and Catalysis
Nandita Biswas1, Rajarshi Mondal1, Kamal Uddin Ansari1
1Institute of Chemistry, The Hebrew University, Edmund Safra Campus, Jerusalem, 91904, Israel.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 8, 2025
Summary
This study introduces robust high-valent nickel complexes stabilized by a PC(sp3)P pincer ligand. The Ni(III) complex efficiently catalyzes alkene hydrosilylation under mild conditions.
Area of Science:
- Organometallic Chemistry
- Catalysis
- Materials Science
Background:
- High-valent metal complexes are crucial in catalysis.
- Pincer ligands offer unique stabilization and control over metal centers.
- Developing stable, well-defined high-valent complexes remains a challenge.
Purpose of the Study:
- To synthesize and characterize novel high-valent organometallic nickel complexes.
- To investigate the redox behavior and stability of these complexes.
- To explore their catalytic activity in organic transformations.
Main Methods:
- Synthesis of nickel complexes with a functionalized PC(sp3)P pincer ligand.
- Characterization using spectroscopic and analytical techniques.
- Evaluation of catalytic performance in alkene hydrosilylation.
Main Results:
- Successful synthesis of robust nickel complexes in +2, +3, and +4 oxidation states.
- Demonstrated stability and predictable redox behavior of the nickel center within the ligand framework.
- Identification of the Ni(III)-PC(sp3)P complex as an efficient catalyst for mild and selective alkene hydrosilylation via a nonoxidative mechanism.
Conclusions:
- The PC(sp3)P pincer ligand effectively stabilizes high-valent nickel species.
- These complexes exhibit tunable redox properties and remarkable stability.
- The Ni(III) complex represents a promising catalyst for hydrosilylation reactions.
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