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- W2000255963 abstract "The ionization of trifluoromethane-, methane-, and benzene-sulfonic acids in Me 2 SO and in water has been studied by 13 C nuclear magnetic resonance. While the protonation shifts of CF 3 SO 3 − and CH 3 SO 3 − in both solvents are too small to make a quantitative interpretation possible, the C 6 H 5 SO 3 − shift data in H 2 O–H 2 SO 4 mixtures, when treated by the method of Cox and Yates, gave a pK a value of −2.5 for the ionization of C 6 H 5 SO 3 H. Our results are discussed in relation to those of other workers. Enthalpies of solution and of ionization of these acids and related compounds have been obtained in both solvents. Single ion enthalpies of transfer from water to Me 2 SO have been calculated from our data and from a transfer value for CF 3 SO 3 − (+1.9 kJ mol −1 ) based on the tetraphenylarsonium–tetraphenylborate extrathermodynamic assumption. The transfers are endothermic processes for the anions CH 3 SO 3 − (+29.6 kJ mol −1 ), C 6 H 5 SO 3 − (+ 20.2 kJ mol −1 ), and p-CH 3 C 6 H 4 SO 3 − (+ 21.8 kJ mol −1 ), and exothermic for H + (−27.4 kJ mol −1 ). These results are discussed in terms of the properties of the ions and solvents. The transfer value for H + is a valuable measure of the basicity difference between bulk water and Me 2 SO. Keywords: sulfonic acids, ionization, dimethylsulfoxide, 13 C NMR, calorimetry." @default.
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- W2000255963 date "1989-12-01" @default.
- W2000255963 modified "2023-09-26" @default.
- W2000255963 title "Ionization of sulfonic acids and dimethylsulfoxide basicity. A <sup>13</sup>C nuclear magnetic resonance and calorimetric study" @default.
- W2000255963 doi "https://doi.org/10.1139/v89-334" @default.
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