Enthalpiesof mixing of o- and m-isomersat 298.15 K |
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Authors: | T. Kimura Y. Takahashi T. Kamiyama M. Fujisawa |
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Affiliation: | (1) Department of Chemistry, Kinki University, Higashi-osaka Japan, 577-8502, 3-4-1 Kowakae |
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Abstract: | Excess enthalpies (H E) of 17 binary mixtures of o- and m-isomers of dichlorobenzene, difluorobenzene, methoxymethylbenzene, dimethylbenzene, dimethoxybenzene, aminofluorobenzene, fluoronitrobenzene, diethylbenzene, chlorofluorobenzene, fluoroiodobenzene, bromofluorobenzene, chloromethylbenzene, fluoromethylbenzene, bromomethylbenzene, iodomethylbenzene, fluoromethoxybenzene, dibromobenzene at 298.15 K were measured. All excess enthalpies measured were very small, and those of o-+m-isomers of aminofluorobenzene, dibromobenzene and iodomethylbenzene were negative but 14 other binary mixtures of isomers were positive over the whole range of mole fractions. H E of o-+m-isomers of dimethoxybenzene showed the largest enthalpic instability and those of aminofluorobenzene showed the largest enthalpic stability. There was a correlation between dipole–dipole interaction, dipole–induced dipole interaction or entropies of vaporization and excess partial molar enthalpies at infinite dilution. |
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Keywords: | dipole– dipole interaction dipole– induced dipole interaction entropy of vaporization excess enthalpy o-, m-isomer structural isomer |
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