Abstract
Sixteen Schiff's bases have been prepared from salicylaldehyde and substituted anilines and their stoichiometric protonation constants have been determined in dioxan—water mixtures of 30, 40, 50 and 60% dioxan (v/v) using a combined pH electrode at 25°C, under nitrogen atmosphere. The calculation of the constants has been carried out using a PKAS computer programme. The effects of the substituents on the protonation constants and the additivities of these effects are discussed. Furthermore, it was found that the log K OH value increases but the log K NH value decreases for all Schiff's bases if the percentage of dioxan is increased.
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