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Issue 31, 2018
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Isolation of EPR spectra and estimation of spin-states in two-component mixtures of paramagnets

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Abstract

The presence of multiple paramagnetic species can lead to overlapping electron paramagnetic resonance (EPR) signals. This complication can be a critical obstacle for the use of EPR to unravel mechanisms and aid the understanding of earth abundant metal catalysis. Furthermore, redox or spin-crossover processes can result in the simultaneous presence of metal centres in different oxidation or spin states. In this contribution, pulse EPR experiments on model systems containing discrete mixtures of Cr(I) and Cr(III) or Cu(II) and Mn(II) complexes demonstrate the feasibility of the separation of the EPR spectra of these species by inversion recovery filters and the identification of the relevant spin states by transient nutation experiments. We demonstrate the isolation of component spectra and identification of spin states in a mixture of catalyst precursors. The usefulness of the approach is emphasised by monitoring the fate of the chromium species upon activation of an industrially used precatalyst system.

Graphical abstract: Isolation of EPR spectra and estimation of spin-states in two-component mixtures of paramagnets

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Publication details

The article was received on 14 Mar 2018, accepted on 19 Apr 2018 and first published on 19 Apr 2018


Article type: Paper
DOI: 10.1039/C8DT00977E
Citation: Dalton Trans., 2018,47, 10473-10479
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    Isolation of EPR spectra and estimation of spin-states in two-component mixtures of paramagnets

    S. Chabbra, D. M. Smith and B. E. Bode, Dalton Trans., 2018, 47, 10473
    DOI: 10.1039/C8DT00977E

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