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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Reduced Cobalt Corroles: Isolation, Reactivity, and Electronic Structure.

Christopher J Reyes1, Jeanet Conradie2,3, Abhik Ghosh3

  • 1Department of Chemistry, University of Texas at San Antonio (UTSA), San Antonio, Texas 78249, United States.

Inorganic Chemistry
|August 21, 2025
PubMed
Summary
This summary is machine-generated.

Researchers synthesized and characterized novel cobalt corrolate complexes, [CoII(TPC)]- and [CoI(TPC)]2-. These reduced cobalt compounds exhibit unique reactivity and electronic structures, paving the way for catalytic applications.

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Corrole ligands are versatile macrocycles with tunable electronic properties.
  • Cobalt corrole complexes have shown potential in catalysis and bioinorganic chemistry.
  • Understanding the electronic structure of reduced cobalt corroles is crucial for their application.

Purpose of the Study:

  • To synthesize and characterize novel reduced cobalt corrolate species.
  • To investigate the solid-state structures and electronic properties of these complexes.
  • To explore the reactivity of reduced cobalt corroles and their potential catalytic applications.

Main Methods:

  • Chemical reduction of a cobalt(III) precursor using KC8 or Na(Hg).
  • Isolation and X-ray crystallographic analysis of alkali metal salts of reduced cobalt corrolates.
  • Reaction of cobalt(II) corrolate with nitric oxide to form a nitrosyl complex.
  • Reactivity studies of cobalt(I) corrolate with CO, CO2, and alkyl iodides.
  • Quantum chemical calculations to determine electronic structures.

Main Results:

  • Successfully synthesized and isolated [CoII(TPC)]- and [CoI(TPC)]2- for the first time.
  • Determined the four-coordinate, non-axially ligated solid-state structures of the reduced complexes.
  • Synthesized the first cobalt corrole nitrosyl compound, [Co(NO)(TPC)]-.
  • Observed reactivity of cobalt(I) corrolate with CO, CO2, and alkyl iodides, including alkylation to form [CoIII(R)(TPC)]-.
  • Quantum chemical calculations confirmed closed-shell corrolate ligand descriptions and experimental ground states.

Conclusions:

  • The reduced cobalt corrolates exhibit unique structural and electronic properties, with closed-shell corrolate ligands.
  • These complexes demonstrate diverse reactivity, including nitrosylation and alkylation, highlighting their potential as catalysts.
  • The findings provide fundamental insights into cobalt corrole chemistry and their utility in reductive transformations.