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Protonation constants of some substituted salicylideneanilines in dioxan—water mixtures

✍ Scribed by Turgut Gündüz; Esma Kiliç; Esin Canel; Fitnat Köseo > glu

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
543 KB
Volume
282
Category
Article
ISSN
0003-2670

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✦ Synopsis

Sixteen Schiffs bases have been prepared from sahcylaldehyde 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 PRAS computer programme. The effects of the substituents on the protonation constants and the additivities of these effects are dhxussed. Furthermore, it was found that the log KOH value increases but the log Km value decreases for all Schiffs bases if the percentage of dioxan is increased.

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