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

被引：0
|
作者：
O. E. Sherif
Y. M. Issa
S. M. Abbas
机构：
[1] Cairo University,Department of Chemistry, Faculty of Science
[2] Cairo University,Beni Suef Branch, Department of Chemistry, Faculty of Science
来源：
Journal of Thermal Analysis and Calorimetry | 2000年 / 59卷
关键词：
benzopyran-4-one; chromone; ionic strength; potentiometry; Schiff bases; temperature and solvent;
D O I：
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中图分类号：
学科分类号：
摘要：
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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页码：913 / 926
页数：13
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