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Thermodynamic Parameters of Some Schiff Bases Derived From 5,7-dihydroxy-6-formyl-2-methylbenzopyran-4-one

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Abstract

Potentiometric studies on Schiff bases derived from5,7-dihydroxy-6-formyl-2-methylbenzopyran- 4-one were carried out at different ionic strengths (0.02, 0.04, 0.06, 0.10 and 0.14 M NaCl), at different temperatures (25, 35, 45 and55°C) and in ethanol-water media of varying compositions (60, 70, 80 and 90% v/v). The ionization constants of the Schiff bases were investigated in the presence of different organic solvents (70% v/v), e.g. methanol, ethanol, n-propanol, isopropanol, acetone, DMSO and DMF-water media. The thermodynamic parameters (ΔG, ΔH and ΔS) were also calculated.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt

    O. E. Sherif & Y. M. Issa

  2. Beni Suef Branch, Department of Chemistry, Faculty of Science, Cairo University, Beni Suef, Egypt

    S. M. Abbas

Authors
  1. O. E. Sherif
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  2. Y. M. Issa
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  3. S. M. Abbas
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Sherif, O.E., Issa, Y.M. & Abbas, S.M. Thermodynamic Parameters of Some Schiff Bases Derived From 5,7-dihydroxy-6-formyl-2-methylbenzopyran-4-one. Journal of Thermal Analysis and Calorimetry 59, 913–926 (2000). https://doi.org/10.1023/A:1010182527146

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