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Updated: Jun 15, 2026

Temperature-programmed Deoxygenation of Acetic Acid on Molybdenum Carbide Catalysts

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Published on: February 7, 2017

Oxygen-atom transfer to a nucleophilic molybdenum complex.

Mohammad S Askari¹, Xavier Ottenwaelder

¹Department of Chemistry and Biochemistry, Concordia University, 7141 Sherbrooke st. West, Montreal, QC H4B 1R6, Canada.

Dalton Transactions (Cambridge, England : 2003)

|February 25, 2010

Summary

The reactivity of imido-molybdenum(IV) complexes with iodine-based oxidants was studied. This research revealed a novel micro-oxodimolybdenum(V) dimer and a transient oxo species, advancing organometallic chemistry.

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Area of Science:

Organometallic Chemistry
Inorganic Chemistry
Reaction Mechanisms

Background:

The study focuses on the reactivity of imido-molybdenum(IV) complexes, specifically [(eta(5)-Cp)(2)Mo(N(t)Bu)].
Investigating reactions with iodine-based oxidants like PhIO is crucial for understanding metal-ligand interactions and oxidation states.

Purpose of the Study:

To investigate the reactivity of the imido-Mo(IV) species [(eta(5)-Cp)(2)Mo(N(t)Bu)] towards PhIO.
To characterize the resulting products and elucidate the reaction mechanism.

Main Methods:

Reaction of imido-Mo(IV) complex with PhIO.
X-ray crystallography for structural determination of the dimer.
(1)H-NMR spectroscopy for structural analysis.
Density Functional Theory (DFT) calculations to investigate the reaction pathway.

Main Results:

The reaction yielded a micro-oxodimolybdenum(V) dimer, [{(eta(5)-Cp)(eta(1)-Cp)Mo(N(t)Bu)}(2)O].
X-ray crystallography and (1)H-NMR confirmed a structural change where one eta(5)-Cp ligand slipped to an eta(1)-Cp ligand on each molybdenum center due to oxygen coordination.
DFT calculations suggest a transient Mo(IV)-oxo species as a key intermediate in the oxidation reaction.

Conclusions:

The oxidation of imido-Mo(IV) with PhIO leads to the formation of a dimeric Mo(V) complex with altered Cp ligand coordination.
The reaction proceeds through a transient Mo(IV)-oxo intermediate, providing insights into the oxidation mechanism of organomolybdenum compounds.