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N,N'-Diaryl-Sulfurdiimides are Strongly Redox Tuned
Nathan D D Hill1, René T Boeré1
1Department of Chemistry and Biochemistry and The Canadian Centre for Research in Advanced Fluorine Technologies, University of Lethbridge, 4401 University Dr. W, Lethbridge, AB, Canada, T1K3M4.
This study details nine aryl sulfur diimides (SDIs), revealing their tunable electrochemical properties. Substituent effects strongly influence reduction potentials, correlating with computed orbital energies, offering new insights into thiazyl chemistry.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Computational Chemistry
Background:
- Sulfur diimides (SDIs) are a class of thiazyl compounds with unique properties.
- Understanding their fundamental characteristics is crucial for developing new materials and chemical processes.
Purpose of the Study:
- To synthesize and characterize nine aryl sulfur diimides (SDIs).
- To investigate the electrochemical behavior and substituent effects on reduction potentials.
- To clarify physical properties and solution-state conformations of SDIs.
Main Methods:
- Synthesis and extensive experimental characterization of nine SDIs.
- Computational modeling to investigate fundamental properties.
- Electrochemical analysis, including reduction potential measurements.
- Electron paramagnetic resonance (EPR) spectroscopy.
- Infrared (IR) spectroscopy and X-ray crystallography.
Main Results:
- Demonstrated a strong, quantifiable correlation between substituent properties and SDI reduction potentials.
- Established a close link between electrochemical response and computed orbital energies.
- Determined the nature, localization, and lifetimes of SDI radical anions using EPR.
- Corrected historical assignments of IR spectroscopic data and resolved long-standing questions about solution-state conformations.
- Showcased the utility of NoSpherA2 software for accurate crystal structure refinement.
Conclusions:
- The electrochemical behavior of SDIs is highly tunable by substituents.
- Computational and experimental data provide a clear understanding of SDI properties.
- This work resolves key ambiguities regarding SDI structure and spectroscopy.
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