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Determination of the acid dissociation constants of the p-sulphonato-calix[4]arene | ||
| Journal of Nanoanalysis | ||
| مقاله 7، دوره 1، شماره 1، تیر 2014، صفحه 47-51 اصل مقاله (719.49 K) | ||
| شناسه دیجیتال (DOI): 10.22034/jna.2014.01.007 | ||
| نویسندگان | ||
| Monireh Hajmalek* 1؛ Mohammad Sajjad Khalili2؛ Karim Zare1؛ Omid Zabihi1 | ||
| 1Department of Chemistry, Islamic Azad University, Science and Research Branch, Tehran, Iran | ||
| 2Department of Chemistry, Faculty of Science and Engineering, Islamic Azad University, Saveh Branch, Saveh, Iran | ||
| چکیده | ||
| The acid dissociation constants of the hydroxyl groups in 25, 26, 27, 28-tetrahydroxy-5, 11, 17, 23-tetrasulphonic-calix[4]arene (SC4) were determined at 25οC by a combination of potentiometric and spectrophotometric titration method. The first and second acid dissociation constants (pKa1, pKa2) were found to be 3.19 and 12.1, which demonstrated pKa shift due to intramolecular hydrogen bonding interactions among hydroxyl groups in SC4. | ||
| کلیدواژه‌ها | ||
| p-sulfonatocalix[4]arene؛ acid–base properties؛ acid dissociation constant | ||
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