PH-metric and Theoretical Studies of The Complexation of 2-[α-(o-hydroxyphenyl)ethylidenehydrazino]-4,6-dimethylquinoline and 2-[α-(o-methoxyphenyl)methylidenehydrazino]-4,6-dimethylquinoline | ||
| Egyptian Journal of Chemistry | ||
| Article 10, Volume 62, Issue 4, April 2019, Pages 691-705 PDF (1.47 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejchem.2018.5110.1451 | ||
| Authors | ||
| Fatma Samy* 1; Hussein Saker Seleem2; Ali Taha1; Magdy Shebl3; Faten Hanfy1 | ||
| 1Department of Chemistry, Faculty of Education, Ain Shams University, Roxy, Cairo 11341, Egypt | ||
| 2Department of Chemistry, Faculty of Education, Ain Shams University, Roxy, Cairo 11341, Egypt. | ||
| 3Department of chemistry, faculty of education, ain shams university | ||
| Abstract | ||
| 2-[α-(o-hydroxyphenyl)ethylidenehydrazino]-4,6-dimethylquinoline (AHQ) and 2-[α-(o-methoxyphenyl)methylidenehydrazino]-4,6-dimethylquinoline (BHQ) have been synthesized and characterization is performed by elemental analysis and electronic, vibrational and mass spectra. The pKH and log K were gritty in 75% solvent-water pH-metrically for BHQ ligand and at various temperatures for AHQ ligand. The dissociation and stability constants in the aqueous medium for BHQ ligand have been calculated by the relation of pKH or log K with solvent parameters (D, ET, AN and DN). The isokinetic temperature was determined by using a linear regression analysis (LRA) of ΔΗ° vs. ΔS° for AHQ complexes. The thermodynamic parameters of AHQ compounds were analyzed into their electrostatic (el) and non-electrostatic (non) or cratic components. Full geometrical and structural optimizations of the ligands have been performed by a DFT study by using the hyperchem program. | ||
| Keywords | ||
| Quinolinyl hydrazones; Stability constants; Theoretical studies; Solvent and thermodynamic parameters | ||
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