Abstract
Using the Picker flow calorimeter, excess molar enthalpies HE have been obtained at 25°C for mixtures of 1,2-, 1,3- and 1,4-cis- and trans-dimethylcyclohexane and cis- and trans-decalin with n-hexadecane and the highly branched C16 isomer, 2,2,4,4,6,8,8-heptamethylnonane. Values of HE are also obtained for cis- and trans-decalin mixed with C6, C7, and C9 isomers. Anomalously low values of HE occur for normal alkanes mixed with cycloalkanes in the di-equatorial configuration, suggesting the presence of a negative contribution in HE possibly due to a restriction of n-alkane molecular motion by the flat, plate-like cycloalkane.
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de St. Romain, P., Patterson, D. Isomer effects in the excess enthalpies of mixtures of alkanes and cycloalkanes. J Solution Chem 11, 119–125 (1982). https://doi.org/10.1007/BF01036379
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DOI: https://doi.org/10.1007/BF01036379