Abstract
Molar excess volumes VE at 25°C have been determined by vibrating-tube densimetry, as a function of mole fraction x for different series of an alkanoate (H 2m+1 C m COOC n H 2n+1 )+cyclohexane. Three types of alkanoates were investigated, i.e., methanoates (m=0, with n=3 and 4), ethanoates (m=1, with n=2, 3, and 4) and propanoates (m=2, with n=1, 2, and 3). In addition, a Picker flow calorimeter was used to obtain molar excess heat capacities C E p at constant pressure at the same temperature. VE is positive for all systems and rather symmetric, with VE (x=0.5) amounting to almost identical values in a series of mixtures containing an alkanoate isomer of same formula (say C4H8O2, C5H10O2, or C6H12O2). The composition dependence of C E p is rather unusual in that two more or less marked minima are observed for most of the mixtures, especially when the alkanoate is a methanoate or an ethanoate. These results are discussed in terms of possible changes in conformation of both the ester and cyclohexane.
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Jimenez, E., Romani, L., Andrade, M.I.P. et al. Molar excess heat capacities and volumes for mixtures of alkanoates with cyclohexane at 25°C. J Solution Chem 15, 879–890 (1986). https://doi.org/10.1007/BF00646029
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DOI: https://doi.org/10.1007/BF00646029