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Sigma-borane complexes of iridium: synthesis and structural characterization.
Travis J Hebden1, Melanie C Denney, Vincent Pons
1Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, USA.
This study details the synthesis and structural characterization of novel iridium-borane complexes, including a unique B-H sigma-bond to iridium. These findings advance understanding of organometallic chemistry and borane reactivity.
Area of Science:
- Organometallic Chemistry
- Inorganic Chemistry
- Boron Chemistry
Background:
- Iridium complexes with phosphine ligands are crucial in catalysis.
- Borane complexes exhibit diverse reactivity and bonding modes.
- Understanding sigma-bond formation is key to novel reaction pathways.
Purpose of the Study:
- To synthesize and characterize new iridium-borane complexes.
- To investigate the structural features of B-H sigma-bonds to iridium.
- To explore the reactivity and stability of these novel compounds.
Main Methods:
- Synthesis of iridium complexes using sodium borohydride and borane reagents.
- Structural determination via neutron diffraction and X-ray diffraction.
- Characterization using NMR spectroscopy and crystallographic analysis.
Main Results:
- Formation of (tBuPOCOP)IrH2(BH3) (1) with a B-H sigma-bond to iridium.
- Characterization of pinacol borane (2, 3) and 9-borobicyclononane (4) adducts.
- Structural data revealing an elongated B-H bond distance in complex 1.
Conclusions:
- The study successfully synthesized and characterized novel iridium-borane complexes.
- The presence of a B-H sigma-bond to iridium was confirmed structurally.
- These findings provide insights into the coordination chemistry of boranes with iridium.
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