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Potentiometric Determination of Acidity Constants of Some Synthesized Organic Compounds in Organic-Water Media | ||
| Journal of Sciences, Islamic Republic of Iran | ||
| مقاله 3، دوره 27، شماره 4، بهمن 2016، صفحه 321-328 اصل مقاله (1.84 M) | ||
| نوع مقاله: Final File | ||
| نویسندگان | ||
| Sh. Baluja* ؛ P. Ramavat؛ K. Nandha | ||
| Physical Chemistry Laboratory, Department of Chemistry, Saurashtra University, Rajkot-360005 (Gujarat), India | ||
| چکیده | ||
| The acidity constants of some synthesized protonated pyrazolo quinazoline compounds were determined potentiometrically at ionic strength of 0.1 M in DMF: water (60:40 v/v) system at different temperatures (298.15 K to 318.15 K). The pKa values have been found to increase with increasing electron-donating nature of substitutions. Some thermodynamics parameters such as enthalpy (ΔH°), Gibb’s free energy (ΔG°) and entropy (ΔS°) of reactions have also been evaluated at different temperatures for these systems. The thermodynamic parameters indicate that dissociation process is not spontaneous and exothermic. | ||
| کلیدواژه‌ها | ||
| Acidity constant؛ Pyrazolo[5,1-b]quinazolines؛ Enthalpy؛ Entropy؛ Gibb’s energy | ||
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آمار تعداد مشاهده مقاله: 884 تعداد دریافت فایل اصل مقاله: 948 |
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