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Electron Spin Relaxation of SO2− and SO3− Radicals in Solid Na2S2O4, Na2S2O5, and K2S2O5

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Abstract

Electron spin relaxation times are reported for the SO2− radical in solid Na2S2O4 and K2S2O5, and the SO3− radicals in Na2S2O5, and K2S2O5. Echo envelope modulation was observed for the radicals in the Na+ salts and characterized by HYSCORE. Tm and T1 were measured using spin echo methods from 40 to 293 K and by long-pulse saturation recovery at 293 K. At low temperature Tm for the radicals in K2S2O5 (~ 14 μs) is longer than for the radicals in Na2S2O5 (Tm ~ 7 μs) or Na2S2O4 (Tm ~ 4 μs), which is attributed to the low magnetic moment of K+. The shorter value of Tm in Na2S2O4 is attributed in part to higher spin concentration. Tm decreases with increasing temperature as T1 approaches Tm. In each lattice there is a distribution of spin lattice relaxation times that may be due to distributions in interspin distances. The long components in the T1 distributions are longer for SO3− than for SO2−. In 0.5 M NaOH solution at 293 K SO2− has a relaxation-determined Lorentzian peak-to-peak linewidth of about 0.7 G, and T1 ~ T2 ~ 100 ns.

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Funding

This work was funded in part by the National Institutes of Health R01 CA262159 (GRE, PI), and in part by the University of Denver.

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  1. Department of Chemistry and Biochemistry, University of Denver, 2101 E. Wesley Ave., Denver, CO, 80210, USA

    Georgina Amassah, Deborah G. Mitchell, Tanden A. Hovey, Sandra S. Eaton & Gareth R. Eaton

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GA, DGM, TH, SSE and GRE performed experiments, analyzed data, and contributed to drafts of the manuscript. All authors reviewed the manuscript.

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Correspondence to Gareth R. Eaton.

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Amassah, G., Mitchell, D.G., Hovey, T.A. et al. Electron Spin Relaxation of SO2− and SO3− Radicals in Solid Na2S2O4, Na2S2O5, and K2S2O5. Appl Magn Reson 54, 849–867 (2023). https://doi.org/10.1007/s00723-023-01569-0

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