EPR Study of the Equilibrium between Peroxydisulfuryl Difluoride and Fluorosulfate Free Radicals in the Gaseous State

The EPR spectrum of the fluorosulfate radical SO₃F· in the gaseous state was observed as a single broad line at temperatures between 390° and 480°K. The linewidth between points of maximum slope was found to be 41.5 G, with a g value of 2.010. The change in free energy $\mathrm{\Delta F}$ of the reversible reaction S₂O₆F₂⇆2SO₃F· was found to be 10.6 ± 1.0 kcal/mole from the temperature dependence of the resonance line amplitude, and the energy of dissociation $\mathrm{\Delta E}$ estimated to be approximately 27 kcal/mole.