Determination of the acid dissociation constants of the p-sulphonato-calix[4]arene
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.
کلید واژگان
p-sulfonatocalix[4]areneacid–base properties
acid dissociation constant
شماره نشریه
1تاریخ نشر
2014-04-011393-01-12
ناشر
Tehran Medical Sciences, Islamic Azad University, Tehran, Iranسازمان پدید آورنده
Department of Chemistry, Islamic Azad University, Science and Research Branch, Tehran, IranDepartment of Chemistry, Faculty of Science and Engineering, Islamic Azad University, Saveh Branch, Saveh, Iran
Department of Chemistry, Islamic Azad University, Science and Research Branch, Tehran, Iran
Department of Chemistry, Islamic Azad University, Science and Research Branch, Tehran, Iran
