Amperometric Titrations of Acyclic Polyamines at Dropping Mercury Electrode with Strong Acids in Acetonitrile

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A new anodic wave in polarography other than the original anodic wave or waves from each acyclic polyamine (ethylenediamine to tetraethylenepentamine) appeared by the addition of HClO₄ or p-toluenesulfonic acid. Successive cathodic waves were given by the conjugate acids from a polyamine. A good linearity was observed between E_1/2 of the conjugate acids and the protonation constants of a polyamine (diethylenetriamine, triethylenetetramine, tetraethylenepentamine), except the first protonation step.