Related Experiment Video
Updated: Jan 7, 2026
10:52
Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
Published on: July 27, 2022
3.2K
Cationic and Neutral Heterometallic Ir-Group 12 Element Polyhydride Compounds: Synthesis, Structure and Reactivity
Amber M Walsh1, Carlos Martín-Fernández2, John P Lowe1
1Department of Chemistry, University of Bath, Bath BA2 7AY, U.K.
Inorganic Chemistry
|January 1, 2026
Summary
This study details the synthesis and reactivity of novel iridium-zinc and iridium-cadmium heterometallic hydride complexes. These complexes, featuring N-heterocyclic carbene ligands, expand the known family of polyhydride compounds.
Area of Science:
- Organometallic Chemistry
- Coordination Chemistry
- Catalysis Research
Background:
- N-heterocyclic carbenes (NHCs) are versatile ligands in organometallic chemistry.
- Polyhydride complexes are important in catalysis and fundamental studies.
- Heterometallic complexes offer unique reactivity and structural diversity.
Purpose of the Study:
- To synthesize and characterize novel iridium-zinc and iridium-cadmium heterometallic hydride complexes.
- To investigate the reactivity of these complexes, including dehydrogenation and hydride elimination pathways.
- To explore the structural and electronic properties of these new polyhydride species.
Main Methods:
- Synthesis of iridium complexes using [Ir(IPr)2H2][BArF4] as a precursor.
- Reactions with organometallic reagents (M'R2) and unsaturated substrates.
- Characterization using X-ray crystallography, NMR spectroscopy, and computational analysis.
Main Results:
- Formation of square-pyramidal [Ir(IPr)(IPr″)(M'R)H][BArF4] complexes via NHC dehydrogenation and R-H elimination.
- Synthesis of polyhydride intermediates and highly fluxional species under H2 atmosphere.
- Characterization of pentahydride Ir(IPr)2H5 and related complexes through reactions with Lewis bases and organometallic reagents.
Conclusions:
- The study successfully prepared and characterized a range of new Ir-Zn and Ir-Cd heterometallic hydride complexes.
- The reactivity highlights the influence of NHC ligands and metal centers on hydride dynamics.
- These findings contribute to the limited but growing field of polyhydride complexes with NHC ligands.
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