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 ΔF 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 ΔE estimated to be approximately 27 kcal/mole.