Abstract

The comparison between thermodynamic pKa values and oxidation potentials of the pentacyanoferrate(II) complexes of a series of azoles shows the existence of two parallel lines: one for pyrazoles and another one for benzazoles. Using the equation corresponding to the second one, the pKa value of 1-methylbenzotriazole (2.49) can be estimated from the E1/2 value of its complex. Keywords: azole basicity, oxidation potentials, pyrazoles, benzotriazoles.

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