Excess molar volumes of (a cyclic amide + water) at 298.15 K and 308.15 K

Abstract Excess molar volumes V m E for the binary mixtures of 2-pyrrolidinone, 1-methyl-2-pyrrolidinone, 3-methyl-2-oxazolidinone, and 1,3-dimethyl-2-imidazolidinone with water have been determined by use of bicapillary pyknometers at 298.15 and 308.15 K over the entire composition range. In all mixtures, the excess molar volumes are negative over the whole mole-fraction range. The minimum value of V m E decreases in the order: 3-methyl-2-oxazolidinone > 2-pyrrolidinone > 1-methyl-2-pyrrolidinone > 1,3-dimethyl-2-imidazolidinone. This order is discussed from the viewpoint of the difference in strength of the interaction of water with the carbonyl oxygen in the organic compounds.