The stoichiometric protonation constants of some N-substituted amidoximes h
ave been determined potentiometrically in a 50% ethanol-water mixture (v/v)
at 25 degrees C and at constant ionic strength. A calculation was performe
d using a PC software. The variation of the protonation constants of these
compounds was interpreted on the basis of structural effects exposed by the
substituents and main skeleton.