Thermodynamic properties of methylquinolines: Experimental results for 2,6-dimethylquinoline and mutual validation between experiments and computational methods for methylquinolines

Published

May 1, 2007

Author(s)

Robert D. Chirico, Russell D. Johnson III, William Steele

Abstract

Measurements leading to the calculation of the standard thermodynamic properties for gaseous 2,6-dimethylquinoline (Chemical Abstracts registry number [877-43-0]) are reported. Experimental methods included adiabatic heat-capacity calorimetry, vibrating-tube densimetry, comparative ebulliometry, inclined-piston gauge manometry, differential-scanning calorimetry (dsc), and combustion calorimetry. The critical temperature was measured with dsc. The critical pressure and critical density were estimated. Molar entropies, molar enthalpies, and molar Gibbs free energies of formation for the ideal gas state were derived at selected temperatures between 298.15 K and 700 K. Results are compared with experimental property values reported previously in the literature. Independent calculations of the ideal gas entropies were performed at the B3LYP/6-31+G(d,p) model chemistry for 2,6-dimethylquinoline and other methylquinolines (including hindered internal rotations) and are shown to be in excellent accord with the calorimetric results. Implications of these results are discussed.

Citation

Journal of Chemical Thermodynamics

Volume

39

Issue

5

Pub Type

Journals

Keywords

2, 6-dimethylquinoline, heat capacity, vapor pressure, density, critical properties, enthalpy of formation, ideal gas properties, computational chemistry

Citation

Chirico, R. , Johnson, R. and Steele, W. (2007), Thermodynamic properties of methylquinolines: Experimental results for 2,6-dimethylquinoline and mutual validation between experiments and computational methods for methylquinolines, Journal of Chemical Thermodynamics (Accessed December 2, 2024)