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Updated: Aug 8, 2026

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
Observation of a photoexcited state of a paramagnetic transition metal complex by time-resolved electron paramagnetic
Yuri Kandrashkin1, Motoko S Asano, Art van der Est
1Department of Chemistry, Brock University, 500 Glenridge Ave., St. Catharines Ont., Canada L2S 3A1.
Abstract:
The first observation of a spin polarized excited state of a paramagnetic metal-complex using time-resolved electron paramagnetic resonance (TREPR) spectroscopy is reported for octaethylporphinatooxovanadium(iv). The TREPR spectra show well resolved orientation dependent hyperfine splitting to the I = 7/2 vanadium nucleus. The reduction of the hyperfine splitting by a factor of 3 compared to the ground state and the observation of a multiplet pattern of spin polarization allow the TREPR spectra to be assigned to the excited quartet state of the complex. The spin polarization patterns evolve with time and it is postulated that this is a result of the equilibration between the lowest excited quartet and doublet states.
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