The rate of decomposition of murexide depends strongly on the proton concentration. The observed rate constant correlates well with the relative permittivity of the solvent. This correlation is established by measurements in binary mixtures of water–dioxane and water–ethanol between 20 and 40 °C and may be applied to the estimation of the proton concentration in the aqueous domains of microemulsions.
S. Barrabass, K. Stickdorn and W. Knoche, J. Chem. Soc., Faraday Trans., 1995, 91, 637 DOI: 10.1039/FT9959100637
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