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Published on: May 11, 2017
A Stable Aluminum Tris(dithiolene) Triradical
Phuong M Tran1, Yuzhong Wang1, Boris Dzikovski2
1Department of Chemistry and the Center for Computational Chemistry, The University of Georgia, Athens, Georgia 30602-2556, United States.
Researchers synthesized a stable aluminum tris(dithiolene) triradical. This novel compound exhibits a quartet ground state with a small energy gap to a doublet state, confirmed by EPR and magnetometry.
Area of Science:
- Coordination Chemistry
- Materials Science
- Quantum Chemistry
Background:
- Dithiolene complexes are known for their rich redox properties.
- Stable organic radicals are of interest for molecular magnetism and spintronics.
Purpose of the Study:
- To synthesize and characterize a novel aluminum dithiolene radical complex.
- To investigate the electronic and magnetic properties of the resulting triradical.
Main Methods:
- Low-temperature synthesis.
- Single-crystal X-ray diffraction.
- UV-vis and Electron Paramagnetic Resonance (EPR) spectroscopy.
- SQUID magnetometry.
- Density Functional Theory (DFT) computations.
Main Results:
- A stable aluminum tris(dithiolene) triradical (compound 3) was successfully synthesized.
- The quartet ground state was confirmed by variable-temperature continuous wave EPR and SQUID magnetometry.
- A small doublet-quartet energy gap (ΔE_DQ ≈ 0.14–0.18 kcal mol⁻¹) was determined.
- Pulsed EPR provided evidence for radical-aluminum nucleus interactions.
Conclusions:
- The experimental realization of a stable aluminum tris(dithiolene) triradical.
- The compound exhibits a quartet ground state with significant spin density delocalization.
- This work opens avenues for exploring aluminum-based radical systems in molecular magnetism.
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