Analysis of acid-base properties of some p-substituted aromatic hydrazones in aqueous perchloric acid by spectrophotometric and semiempirical methods

Authors

  • Mirjana Stojan Jankulovska Faculty of Agricultural Sciences and Food, Ss. Cyril and Methodius University, Skopje
  • Ilinka Spirevska Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University, Skopje

DOI:

https://doi.org/10.20450/mjcce.2014.370

Keywords:

UV spectroscopy, protonation, thermodynamic dissociation constants, p-substituted aromatic hydrazones, AM1 and PM3 semiempirical methods

Abstract

The acid-base properties of some p-substituted aromatic hydrazones were examined in aqueous perchloric acid medim by spectrophotometric methods. The possible site where the proton may take place and the stability of the protonated form was discussed using the values of the total energy, binding energy, heat of formation and proton affinity calculated according to the semiempirical methods AM1 and PM3. Furthermore, the stability of the protonated forms, as well as, the stability of the isomers (E and Z) was discussed. Electronic absorption studies were utilized for determination of the dissociation constants of the protonated form (pKBH+), numerically and graphically, at different ionic strength (0.1, 0.25 and 0.5 mol/dm3), as well as, thermodynamic dissociation constants.  The influence of the solvent on the appearance of the recorded spectra was compensated by the use of the method of characteristic vector analysis (CVA).

 

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Published

2014-05-02

How to Cite

Jankulovska, M. S., & Spirevska, I. (2014). Analysis of acid-base properties of some p-substituted aromatic hydrazones in aqueous perchloric acid by spectrophotometric and semiempirical methods. Macedonian Journal of Chemistry and Chemical Engineering, 33(1), 85–96. https://doi.org/10.20450/mjcce.2014.370

Issue

Vol. 33 No. 1 (2014)

Section

Analytical Chemistry

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