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Journals / Gazi University Journal of Science / 2014 / Cilt: 27 - Sayı: 2

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

Gülşen TÜRKOĞLU
Halil BERBER
Müjgan ÖZKÜTÜK
Pages
771–783
Publication Date
2014-06-27
DOI
—
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

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).

📌 3 Key Takeaways

🎯
Objective & Hypothesis: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.
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Key Findings & Data: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.
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Conclusion & Impact: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).
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Spectrophotometric determination · Symmetric Schiff base · Acidity Dissociation Constants

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 (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).

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Cite This Article

TÜRKOĞLU, G., BERBER, H., ÖZKÜTÜK, M. (2014). Spectrophotometric determination of the acidity dissociation constants of symmetric Schiff base derivatives. Gazi University Journal of Science, Cilt: 27 - Sayı: 2, 771–783. https://ajindex.com/articles/254835

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