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Current Pharmaceutical Analysis

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ISSN (Print): 1573-4129
ISSN (Online): 1875-676X

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Research Article

Spectroscopic Determination of Dissociation Constants of Some 4- nitrobenzaldehyde-4-substituted phenyl-1-carbonylhydrazones in Sodium Hydroxide Media

Author(s): Mirjana S. Jankulovska*, Ilinka Spirevska, Vesna Dimova and Milena Jankulovska

Volume 17, Issue 6, 2021

Published on: 01 May, 2020

Page: [812 - 821] Pages: 10

DOI: 10.2174/1573412916999200502025457

Abstract

Purpose: Hydrazones are a class of azomethines with a wide spectrum of pharmacological properties that are influenced by the pH of the media. The purpose of this study was to investigate acidbase properties of five 4-nitrobenzaldehyde-4-substitutedphenyl-1-carbonylhydrazones in sodium hydroxide media (14>pH>7).

Methods: The dissociation process was followed by UV-Vis spectroscopy, in ethanol-water (V/V, 1:1) solutions, at room temperature. Semiempirical methods AM1 and PM3 were applied for determination of the deprotonation enthalpies.

Results: The changes in the UV-Vis spectra, as well as the deprotonation enthalpies, suggested that the dissociation process for four investigated hydrazones with an amide group took place in one step. The exception with two dissociation steps was hydrazone with amide and hydroxyl group. The pH region of dissociation was from pH 10.8 to pH 11.6 for the first step and between pH 11.7 and pH 12.1 for the second step of dissociation. The influence of the ethanol on the UV-Vis spectra was eliminated by the method of Characteristic Vector Analyses (CVA). The stoichiometric dissociation constants were determined numerically (pKHA = n·pH + logI) and graphically (intercept of the dependence of logI on pH) from the absorbance data using experimental and reconstructed UV-Vis spectra, at three different ionic strengths. Thermodynamic dissociation constants were estimated graphically as an intercept of dependence of dissociation constant on the square root of the ionic strength.

Conclusion: The obtained results demonstrated that the influence of the substituents on pKHA values was not significant, except for hydrazone with amide and hydroxyl group. Namely, the dissociation of the amide group of this hydrazone was retarded due to the influence of the phenolic group.

Keywords: Hydrazones, dissociation, dissociation constants, deprotonation enthalpy, UV-Vis spectroscopy, semi-empirical methods.

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