title: Enthalpy change on mixing a couple of S- and R-enantiomers of some chiral compounds at 298.15 K.
abstract: Enthalpy change on the mixing of R- and S-enantiomers of chiral liquid compounds such as dimethyl malate (1), methyl 3-hydroxylbutanoate (2), 2-butanol (3), ethyl 4-chloro-3-hydroxylbutanoate (4), 1,3,3-trimethylbicycle-[2.2.1]heptan-2-one (5), 3,7-dimethyl-6-octenal (6), and 8-bromo-2,6-dimethyl-2-octene (7) is measured over the entire range of mole fractions at 298.15 K, albeit very small values. The mixing of chiral liquids of R-1 + S-1, R-2 + S-2, R-3 + S-3, R-6 + S-6, and R-7 + S-7 produces enthalpic destabilization over the entire range of mole fractions, while that of R-4 + S-4 and R-5 + S-5 shows enthalpic stabilization over entire compositions. Enthalpy change on mixing at an equimolar concentration and the intermolecular interaction obtained by the molecular mechanics calculations show a linear correlation, except for a few compounds measured.
authors.affiliation: Department of Chemistry, Kinki University, Higashi-Osaka, Japan. kimura@chem.kindai.ac.jp
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Kimura
authors.forename: Mohammed Abdullah
authors.initials: MA
authors.lastname: Khan
authors.forename: Masakazu
authors.initials: M
authors.lastname: Ishii
authors.forename: Tadashi
authors.initials: T
authors.lastname: Kamiyama