Proton Medium Effects Utilising Ferrocene Redox Couple as Reference in Propylene Glycol-Water, Methanol-Propylene Glycol and Methanol-Water Mixtures

Utilising the ferrocene reference method, proton medium effects (log mϒH+) were determined in methanol-water, propylene glycol-water and methanol-propylene glycol mixtures of varying composition. On the basis of the ferrocene method, it was shown that all methanol-water, propylene glycolwater and methanol-propylene glycol mixtures including the pure solvents are more basic than water and these results were explained in terms of the structural theory of ion solvation proposed by Feakins and coworkers. Further, it was shown that methanol is slightly more basic than propylene glycol which is in agreement with the conclusions arrived from earlier EMF measurements. © 1977, Verlag der Zeitschrift. All rights reserved.