Abstract
Abstract Hammett acidity functions have been measured for Nafion films equilibrated with a series of nitroaniline dyes in hydrochloric acid solutions. The effect of ionic strength of alkali metal and tetraalky-lammonium bromides on the ability of the Nafion film to donate a proton to Bronsted bases is the reverse of that expected for acid in solution. Absorption of neutral and charged dye is also influenced by the concentration and hydrophobicity of the salt in solution. An interpretation based upon structural spectroscopic studies is discussed.
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