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Rapid and precise determination of zero-field splittings by terahertz time-domain electron paramagnetic resonance spectroscopy

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Abstract

Zero-field splitting (ZFS) parameters are fundamentally tied to the geometries of metal ion complexes. Despite their critical importance for understanding the magnetism and spectroscopy of metal complexes, they are not routinely available through general laboratory-based techniques, and are often inferred from magnetism data. Here we demonstrate a simple tabletop experimental approach that enables direct and reliable determination of ZFS parameters in the terahertz (THz) regime. We report time-domain measurements of electron paramagnetic resonance (EPR) signals associated with THz-frequency ZFSs in molecular complexes containing high-spin transition-metal ions. We measure the temporal profiles of the free-induction decays of spin resonances in the complexes at zero and nonzero external magnetic fields, and we derive the EPR spectra via numerical Fourier transformation of the time-domain signals. In most cases, absolute values of the ZFS parameters are extracted from the measured zero-field EPR frequencies, and the signs can be determined by zero-field measurements at two different temperatures. Field-dependent EPR measurements further allow refined determination of the ZFS parameters and access to the g-factor. The results show good agreement with those obtained by other methods. The simplicity of the method portends wide applicability in chemistry, biology and material science.

Graphical abstract: Rapid and precise determination of zero-field splittings by terahertz time-domain electron paramagnetic resonance spectroscopy

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Publication details

The article was received on 22 Feb 2017, accepted on 10 Apr 2017 and first published on 19 Apr 2017


Article type: Edge Article
DOI: 10.1039/C7SC00830A
Citation: Chem. Sci., 2017, Advance Article
  • Open access: Creative Commons BY license
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    Rapid and precise determination of zero-field splittings by terahertz time-domain electron paramagnetic resonance spectroscopy

    J. Lu, I. O. Ozel, C. A. Belvin, X. Li, G. Skorupskii, L. Sun, B. K. Ofori-Okai, M. Dincă, N. Gedik and K. A. Nelson, Chem. Sci., 2017, Advance Article , DOI: 10.1039/C7SC00830A

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