The standard enthalpies of formation of 2-methylbiphenyl and diphenylmethane

doi:10.1006/jcht.1995.0068

The Journal of Chemical Thermodynamics

Volume 27, Issue 6, June 1995, Pages 671-678

https://doi.org/10.1006/jcht.1995.0068 Get rights and content

Abstract

Measurements of the energies of combustion are reported for 2-methylbiphenyl (Chemical Abstracts registry number [643-58-3]), and diphenylmethane (registry number [101-81-5]). Standard enthalpies of combustion and formation in the condensed state are derived for both compounds. Standard enthalpies of vaporization at 298.15 K are reported for both compounds and the corresponding ideal-gas standard enthalpies of formation derived. The results are compared with literature values and discrepancies arising from the use of values for diphenylmethane from a comprehensive compilation are clarified.

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Citation Excerpt :
We have already contributed to this data with the thermodynamic measurements for alkylbiphenyls recently [9–12]. Some additional valuable information was published in the past by Steele et al. [13] for 2-methyl-biphenyl, as well as enthalpies of sublimation of 4-methylbiphenyl and 4,4′-di-methyl-biphenyl were measured using the drop microcalorimetry by Ribeiro da Silva et al. [14]. Miroshnichenko and Paschenko [15] reported calorimetric studies of enthalpy sublimation of 4,4′-di-methyl-biphenyl.
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A revised parameterization of the extended Laidler method for predicting standard molar enthalpies of atomization and standard molar enthalpies of formation at T = 298.15 K for several families of hydrocarbons (alkanes, alkenes, alkynes, polyenes, poly-ynes, cycloalkanes, substituted cycloalkanes, cycloalkenes, substituted cycloalkenes, benzene derivatives, and bi and polyphenyls) is presented. Data for a total of 265 gas-phase and 242 liquid-phase compounds were used for the calculation of the parameters. Comparison of the experimental values with those obtained using the additive scheme led to an average absolute difference of 0.73 kJ · mol⁻¹ for the gas-phase standard molar enthalpy of formation and 0.79 kJ · mol⁻¹ for the liquid-phase standard molar enthalpy of formation. The database used to establish the parameters was carefully reviewed by using, whenever possible, the original publications. A worksheet to simplify the calculation of standard molar enthalpies of formation and standard molar enthalpies of atomization at T = 298.15 K based on the extended Laidler parameters defined in this paper is provided as supplementary material.
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The standard (p^∘ = 0.1 MPa) molar enthalpy of formation for gaseous 2-phenylbenzimidazole (2-PhBIM) and 2-benzylbenzimidazole (2-BzBIM) were derived from the standard molar enthalpies of combustion, at T = 298.15 K, measured by static bomb calorimetry, and the standard molar enthalpy of sublimation, at T = 298.15 K, measured by Calvet microcalorimetry in the case of 2-phenylbenzimidazole or derived from the variation of the vapour pressures, determined by the Knudsen effusion technique, with temperatures between (393 and 412) K for 2-benzylbenzimidazole. Heat capacities, in the temperature ranges from (268.15 to 322.10) K for 2-phenylbenzimidazole and (270.15 to 316.02) K for 2-benzylbenzimidazole, were also measured with a differential scanning calorimeter.

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^☆: Contribution number 354 from the Thermodynamics Research Laboratory at the National Institute for Petroleum and energy Research.

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Regular articleThe standard enthalpies of formation of 2-methylbiphenyl and diphenylmethane☆,☆☆

Abstract

Regular article
The standard enthalpies of formation of 2-methylbiphenyl and diphenylmethane☆,☆☆