Isolation of EPR spectra and estimation of spin-states in two-component mixtures of paramagnets
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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.
Chabbra , S , Smith , D & Bode , B E 2018 , ' Isolation of EPR spectra and estimation of spin-states in two-component mixtures of paramagnets ' , Dalton Transactions , vol. 47 , no. 31 , pp. 10473-10479 . https://doi.org/10.1039/C8DT00977E
© 2018 the Authors. This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1039/C8DT00977E
DescriptionThis work was supported by Sasol Ltd. SC is grateful for a St Leonard’s postgraduate fellowship by the University of St Andrews.
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