Comparison of Spectroscopic and Electrochemical Studies of Disproportionation Equilibria of 1,3,5-Triphenylverdazyl Radical in DMF Containing Carboxylic Acids

Article abstract of DOI:10.1007/BF01045295

Stoichiometry and equilibrium constants for the disproportionation of the title radicals in N,N-dimethylformamide containing salicilic, chloroacetic, and phenylacetic acids were determined on the basis of absorption spectra.On the other hand, only apparent equilibrium constants depending on concentrations of an acid and a radical could be obtained from electrochemical measurements at a mercury electrode.Significant differences in reaction stoichiometry and in order of magnitudes of disproportionation constants found under spectroscopic and electrochemical conditionswere discussed in terms of an influence of the electric field in the double layer on the distribution of different associates formed by verdazyl species with acids.Keywords: Disproportionation equilibrium; Effect of the electrode field.