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06:18
Syntheses, Crystallization, and Spectroscopic Characterization of 3,5-Lutidine N-Oxide Dehydrate
Published on: April 24, 2018
7.9K
Fe(III) bipyrrolidine phenoxide complexes and their oxidized analogues
Linus Chiang1, Didier Savard, Yuichi Shimazaki
1Department of Chemistry, Simon Fraser University , Burnaby, British Columbia V5A 1S6, Canada.
Inorganic Chemistry
|June 3, 2014
Summary
Iron(III) complexes with bipyrrolidine ligands were oxidized to form phenoxyl radicals. Spectroscopic and computational methods confirmed ligand-based oxidation and antiferromagnetic coupling between the iron center and the radical.
Area of Science:
- Coordination Chemistry
- Bioinorganic Chemistry
- Spectroscopy
Background:
- Iron complexes with chiral ligands are crucial in catalysis and materials science.
- Understanding the electronic structure of oxidized metal complexes is key to their reactivity.
- Bipyrrolidine scaffolds offer tunable steric and electronic properties for metal coordination.
Purpose of the Study:
- To synthesize and characterize novel iron(III) complexes with symmetric and dissymmetric bipyrrolidine-based ligands.
- To investigate the electronic structure and redox behavior of these complexes and their one-electron oxidized forms.
- To elucidate the nature of the oxidized species, specifically identifying ligand-based oxidation and magnetic interactions.
Main Methods:
- Synthesis of Fe(III) complexes with H2L(1) and HL(2) ligands.
- Cyclic voltammetry (CV) to study redox properties.
- UV-vis-NIR spectroscopy to monitor electronic transitions.
- Resonance Raman (rR) and Electron Paramagnetic Resonance (EPR) spectroscopy for structural and magnetic characterization.
- Density Functional Theory (DFT) calculations for electronic structure and coupling analysis.
Main Results:
- Successful preparation of neutral Fe(III) complexes and their one-electron oxidized species.
- CV revealed redox waves corresponding to phenoxide to phenoxyl radical oxidation.
- UV-vis-NIR and rR spectroscopy confirmed the presence of phenoxyl radicals with characteristic spectral signatures.
- EPR spectroscopy indicated high spin Fe(III) in neutral complexes and a spin-integer system upon oxidation.
- DFT calculations predicted weak antiferromagnetic coupling between Fe(III) and the phenoxyl radical.
Conclusions:
- The one-electron oxidation of the studied iron(III) complexes results in ligand-based phenoxyl radicals.
- Spectroscopic and computational data support the formation of a coupled spin system involving the Fe(III) center and the radical.
- These findings contribute to the understanding of redox-active metal-ligand systems and their magnetic properties.
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