Spectrophotometric determination of the acidity dissociation constants of symmetric Schiff base derivatives

Year 2014, Volume: 27 Issue: 2, 771 - 783, 27.06.2014

Gülşen Türkoğlu Halil Berber , Müjgan Özkütük

Abstract

In this study, the acidity constants of series symmetric Schiff base derivatives have been determined using the UV-visible spectrophotometric method at a temperature of 25(±0.1) °C. The deprotonated acidity constants (pK_a) have been found to be associated with the deprotonation of phenolate oxygen. The first and the second protonated acidity constants (pK_a1 and pK_a2) have been found to cause the protonation of the imine nitrogen atom for all molecules. The deprotonated acidity constants (pK_a) were found for molecules 5 (9.088), 8 (9.848), 6 (10.243), 2 (10.2569), 3 (10.297), 1 (10.587), 7 (10.692) and 4 (10.804). The first protonation (pK_a1) was found for molecules 2 (3.432), 5 (4.207), 8 (4.612), 7 (4.758), 4 (4.995), 1 (5.288), 6 (5.606) and 3 (6.452). The second protonation (pK_a2) was found for molecules 2 (-5.384), 8 (-5.165), 5 (-5.028), 7 (-4.775), 4 (-4.518), 1 (-4.111), 6 (-3.866) and 3 (-3.212).

Keywords

Spectrophotometric determination, Symmetric Schiff base, Acidity Dissociation Constants, UV-spectroscopy

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