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Updated: Aug 6, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
Chemically Separable Ruthenium Hydride Isomers with Distinct Hydride Transfer Properties
Sai Puneet Desai1, Andressa V Müller1, Chiara Cappuccino1
1Chemistry Division, Brookhaven National Laboratory, Upton, New York11973, United States.
Researchers developed new ruthenium hydride catalysts where the trans ligand controls hydride strength, enabling tunable reactivity for catalysis. This work offers new strategies for hydride transfer reactions.
Area of Science:
- Catalysis
- Organometallic Chemistry
- Chemical Kinetics
Background:
- Transition metal hydrides are crucial in catalysis.
- Controlling hydride donor ability (hydricity) is key for reactivity.
Purpose of the Study:
- To synthesize isomeric ruthenium hydrides with tunable hydricity.
- To investigate the impact of trans ligands on hydride transfer reactivity and mechanisms.
Main Methods:
- Synthesis of ruthenium hydride complexes with N-heterocyclic carbene or pyridine ligands.
- Reactivity studies with CO2 and organic hydride acceptors.
- Kinetic analysis using stopped-flow experiments and isotopic labeling.
- Computational studies and linear free energy relationships (LFERs).
Main Results:
- Ligand modulation of thermodynamic hydricity by up to 8 kcal mol-1.
- Distinct reactivity profiles observed for different ruthenium hydride isomers.
- Outer-sphere hydride transfer mechanism confirmed.
- Disruption of conventional scaling relationships by strong trans effects.
Conclusions:
- Ruthenium hydride hydricity and reactivity can be precisely tuned via trans ligand choice.
- Strong trans effects offer a strategy to overcome limitations in hydride transfer reactions.
- This research opens new avenues for designing catalysts with tailored reactivity.
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