Acid-base ionization equilibria of 1-(2-carbamylethyl) imidazole and its 2-methyl and 2-ethyl derivatives.
The acid and base ionization constants of 1-(2-carbamylethyl)-2-alkylimidazoles, as well as the acid ionization constants of acrylamide and acetamide, have been determined by potentiometry. Concentration constants at 10.0, 25.0 and 40.0 degrees and I = 0.1M (KNO(3)) were measured. From plots of log K vs. 1/T the thermodynamic parameters (DeltaH and DeltaS) of the ionization reactions were calculated.
Vasconcelos
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Chemistry Department, Faculty of Science, University of Oporto, 4000 Oporto, Portugal.
Machado
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