Partial molar volumes of organic compounds in water. Part 4.—Aminocarboxylic acids

Abstract

The partial molar volumes of the α,ω-aminocarboxylic acids up to 11-aminoundecanoic acid, together with those of a number of cyclopentane and cyclohexane analogues, have been measured in water at 25°C, and related to their van der Waals volumes. Similar studies of the isomeric ω-hydroxyalkyl amides have allowed an estimation of the electrostriction arising from the interaction of the charges with the solvent, and the individual contributions due to the carboxylate and alkyl-ammonium ions have been deduced. The application of these values to the calculation of partial molar volumes for aminocarboxylic acids, assuming the spherical model previously described, is illustrated.