Isomer effects in the excess enthalpies of mixtures of alkanes and cycloalkanes |
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Authors: | Pierre de St Romain Donald Patterson |
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Institution: | (1) Research Division, Goodyear Tire Co., Orsay, France;(2) Department of Chemistry, McGill University, 801 Sherbrooke St. W., H3A 2K6 Montreal, Que, Canada |
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Abstract: | Using the Picker flow calorimeter, excess molar enthalpies H
E
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 H
E
are also obtained for cis- and trans-decalin mixed with C6, C7, and C9 isomers. Anomalously low values of H
E
occur for normal alkanes mixed with cycloalkanes in the di-equatorial configuration, suggesting the presence of a negative contribution in H
E
possibly due to a restriction of n-alkane molecular motion by the flat, plate-like cycloalkane. |
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Keywords: | Excess enthalpy isomer effects alkanes cis-decalin trans-decalin dimethylcyclohexanes |
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