Spectrophotometric Determination of the Acidity Dissociation Constants of Symmetric Schiff Base Derivatives

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 (pKa) have been found to be associated with the deprotonation of phenolate oxygen....

Full description

Saved in:

Bibliographic Details
Published in:	Gazi University Journal of Science Vol. 27; no. 2
Main Authors:	Türkoğlu,Gülsen, Berber,Halil, Özkütük,Müjgan Yaman
Format:	Journal Article
Language:	English
Published:	Gazi Üniversitesi Yayınları 01-01-2014
Subjects:	Bilim-Teknoloji Ankara Türkiye Spectrophotometric determination UVspectroscopy Acidity Dissociation Constants Symmetric Schiff base
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	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 (pKa) have been found to be associated with the deprotonation of phenolate oxygen. The first and the second protonated acidity constants (pKa1 and pKa2) have been found to cause the protonation of the imine nitrogen atom for all molecules. The deprotonated acidity constants (pKa) 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 (pKa1) 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 (pKa2) 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).
ISSN:	2147-1762