Dissociation constants for polyfluoro acids of phosphorus in various media

Abstract

1. Various polyfluoro acids of phosphorus have been synthesized. Potentiometric titration in transference cells has been used to determine the dissociation constants of these acids in nitromethane and in 50, 80, 95, and 100% alcohol solutions. 2. The differences in strength of the polyfluoro acids of phosphorus tend to be minimal in aqueous alcoholic solution. 3. The spectral characteristic (ΔνOH) of the H-bonds of phenol-polyfluorophosphoryl complexes have been measured in CCl4 solution. 4. The σФ values of polyfluoroalkoxyl substituents are radically different in aqueous and in water-free solvents. The companion values for 3,3,3-trifluoropropoxy and 3,3,3-trifluoropropyl groups are not affected by changes in the solvent.