2. The composition of claim 1 wherein the anion of said salt is PtF6 .

3. The composition of claim 1 wherein the anion of sald salt is BF4 .

4. The composition of claim 1 wherein the anion of said salt is AsF6 .

6. The method of claim 5 wherein said starting temperature is -196*C.

7. The method of claim 5 wherein said gradually increasing step comprises exposing said container to room temperature.

8. The method of claim 7 wherein said container is exposed to room temperature for a period of approximately 30 minutes to 1 hour.

9. The method of claim 7 wherein said room temperature is 25*C.

10. The method of claim 5 comprising the further steps of: combining said ClO2F2 PtF6 salt with FNO2 at a reaction temperature such that said FNO2 is in a liquid state, maintaining said reaction temperature until the reaction is complete, separating the volatile products by fractional condensation in a series of traps kept at -112*C and -126*C, respectively, combining the condensate of the -126*C trap with BF3 at a temperature at which the materials have no volatility, raising the temperature of said condensate to 20*C and removing all volatile materials, and recovering the resulting ClO2F2 BF4 salt as a nonvolatile solid.

11. The method of claim 10 wherein said reaction temperature is -78*C.

12. The method of claim 10 wherein said maintaining step is continued for approximately 48 hours.

13. The method of claim 10 comprising the further steps of: combining said ClO2F2 BF4 salt and AsF5 in a container at a temperature at which these materials have no volatility, raising the temperature of said container to a temperature at which said AsF5 is liquid, maintaining said container at said temperature at which AsF5 is liquid until the reaction is complete, raising the temperature of said container to ambient temperature, removing the volatile materials, and recovering the resulting ClO2F2 AsF6 salt as a nonvolatile solid.

14. The method of claim 13 wherein said temperature at which AsF5 is liquid is -78*C.