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Corrosion02:49

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The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
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Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods
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Published on: February 11, 2016

Iridium corroles.

Joshua H Palmer1, Michael W Day, Aaron D Wilson

  • 1Beckman Institute, California Institute of Technology, Pasadena, California 91125, USA.

Journal of the American Chemical Society
|June 3, 2008
PubMed
Summary
This summary is machine-generated.

This study synthesizes and characterizes novel iridium(III) corrole complexes. These compounds exhibit planar structures and unique electrochemical properties, including accessible iridium(IV) oxidation states.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Corroles are macrocyclic ligands with unique electronic and photophysical properties.
  • Iridium complexes are known for their catalytic and photoluminescent applications.
  • Fluorinated ligands can significantly alter the stability and reactivity of metal complexes.

Purpose of the Study:

  • To synthesize and fully characterize novel iridium(III) corrole complexes, specifically 5,10,15-tris-pentafluorophenylcorrolato-iridium(III) bis-trimethylamine and its octabromo derivative.
  • To investigate the structural, spectroscopic, and electrochemical properties of these new iridium corrole complexes.
  • To explore the influence of pentafluorophenyl and bromo substituents on the corrole macrocycle and iridium center.

Main Methods:

  • Synthesis of iridium(III) corrole complexes via established organometallic procedures.
  • Full characterization using techniques such as Nuclear Magnetic Resonance (NMR) spectroscopy, UV-Vis spectroscopy, and X-ray crystallography.
  • Electrochemical studies employing cyclic voltammetry to determine redox properties.

Main Results:

  • Successful synthesis and characterization of two iridium(III) corrole complexes.
  • Demonstration of planar corrole structures with minimal deviation from the plane.
  • UV-Vis spectra showing a split Soret band indicative of MLCT transitions.
  • Cyclic voltammetry revealing the inaccessibility of the iridium(II) state and facile oxidation to iridium(IV) at lower potentials compared to other iridium complexes.

Conclusions:

  • The synthesized iridium corrole complexes possess highly planar structures.
  • The electronic properties, particularly the MLCT transitions, are influenced by the corrole ligand and iridium center.
  • The electrochemical behavior indicates unique redox properties, with accessible iridium(IV) states achieved under milder conditions, suggesting potential applications in catalysis or electrochemistry.