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An In Vitro Enzymatic Assay to Measure Transcription Inhibition by Gallium(III) and H3 5,10,15-tris(pentafluorophenyl)corroles
Published on: March 18, 2015
Chromium corroles in four oxidation States.
A E Meier-Callahan1, A J Di Bilio, L Simkhovich
1Beckman Institute, California Institute of Technology, Pasadena, California 91125, USA.
Inorganic Chemistry
|December 12, 2001
Summary
Researchers explored chromium complexes with 5,10,15-tris(pentafluorophenyl)corrole in four oxidation states. They characterized these novel chromium corrole complexes using various spectroscopic and crystallographic methods.
Area of Science:
- Organometallic Chemistry
- Coordination Chemistry
- Materials Science
Background:
- Corrole ligands are versatile macrocycles capable of stabilizing various metal oxidation states.
- Chromium complexes with corrole ligands are of interest due to their unique electronic and structural properties.
Purpose of the Study:
- To isolate and characterize chromium complexes of 5,10,15-tris(pentafluorophenyl)corrole in multiple oxidation states.
- To elucidate the electronic structure and bonding in these novel chromium corrole species.
Main Methods:
- Electrochemical and chemical oxidation/reduction reactions.
- UV-visible absorption spectroscopy.
- Electron Paramagnetic Resonance (EPR) spectroscopy.
- Nuclear Magnetic Resonance (NMR) spectroscopy (¹H NMR).
- X-ray crystallography.
Main Results:
- Four distinct chromium complexes of 5,10,15-tris(pentafluorophenyl)corrole were successfully isolated and characterized.
- Complex 6 was identified as a Cr(V)O ligand-radical species.
- Complex 4 was determined to be a diamagnetic d(2) Cr(IV)O complex.
- The structure of a Cr(III) bis-pyridine complex (3) was confirmed by X-ray crystallography.
Conclusions:
- The study demonstrates the ability of the 5,10,15-tris(pentafluorophenyl)corrole ligand to stabilize a range of chromium oxidation states.
- The characterized complexes exhibit diverse electronic structures, including a ligand-radical species and Cr(IV) and Cr(III) oxidation states.
- These findings contribute to the understanding of chromium corrole chemistry and potential applications.
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