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Updated: Jul 20, 2026

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
Sulfoxide carbon-sulfur bond activation
Joseph M O'Connor1, Kevin D Bunker, Arnold L Rheingold
1Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA. jmoconnor@ucsd.edu
Organometallic chemistry research reveals new cobalt complexes. Alkynylsulfoxide reacts with cobalt to form cobaltosulfoxide, which oxidizes to a cobaltosulfone or converts to cobalt-thiolato dimers.
Area of Science:
- Organometallic Chemistry
- Coordination Chemistry
- Sulfur Chemistry
Background:
- Organosulfur compounds and their metal complexes are crucial in catalysis and materials science.
- Cobalt complexes exhibit diverse reactivity and structural motifs.
- Understanding the transformations of alkynylsulfoxides is key to developing novel organometallic reagents.
Purpose of the Study:
- To synthesize and characterize novel cobalt complexes derived from alkynylsulfoxides.
- To investigate the reactivity of cobaltosulfoxide complexes with oxygen.
- To explore the solution-phase stability and decomposition pathways of cobaltosulfoxide complexes.
Main Methods:
- Reaction of TMSCCSO(p-tolyl) with (eta5-C5H5)Co(PPh3)2.
- Characterization of complexes using X-ray crystallography.
- Oxidation studies with oxygen gas.
- Solution stability studies at room temperature.
Main Results:
- Synthesis of a cobaltosulfoxide complex, (C5H5)Co(PPh3)(eta1-CCTMS)[eta1-(S)-SO(p-tolyl)], characterized by X-ray crystallography.
- Formation of a metallosulfone complex, (C5H5)Co(PPh3)(eta1-CCTMS)[eta1-(S)-SO2(p-tolyl)], upon oxidation.
- Conversion of the cobaltosulfoxide to a 1:4 mixture of equatorial-equatorial and equatorial-axial bridging cobalt-thiolato dimers, {(C5H5)Co[mu-S(p-tolyl)]}2.
- Characterization of the equatorial-equatorial isomer by X-ray crystallography.
Conclusions:
- Alkynylsulfoxides can serve as versatile ligands in cobalt organometallic chemistry.
- Cobaltosulfoxide complexes exhibit distinct reactivity towards oxidation and thermal decomposition.
- The study provides insights into the structural diversity and transformation pathways of cobalt-sulfur complexes.
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