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Protonation constants of some pyridine derivatives in ethanol-water mixtures

✍ Scribed by Esma Kiliç; Fitnat Köseogǧlu; Özlem Başgut

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
533 KB
Volume
294
Category
Article
ISSN
0003-2670

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✦ Synopsis

Protonation constants of a number of mono-and disubstituted pyridines were determined potentiometrically in 0, 10, 20, 30, 40, 50, 60, 70, 80% (v/v) ethanol-water mixtures at 25°C with an ionic strength of 0.1 M. Data were calculated by a computer programme. The logarithm of the protonation constants of pyridines linearly decreased with increase of ethanol contents but the values determined in water and 80% ethanol did not follow this linear trend. Furthermore, the effects of the substituents on the basicity of pyridine, the additivities of these effects and the applicability of the Hammett equation to the behaviour of substituents are discussed.

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