Enthalpies of combustion, vapour pressures, and enthalpies of sublimation of 2-cyanoquinoline and 3-cyanoquinoline

• Published in: The Journal of chemical thermodynamics Vol. 27; no. 11; pp. 1187 - 1196
• Main Authors: Ribeiro da Silva, Manuel A.V., Matos, M.A.R., Amaral, Luı́sa M.P.F.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 1995; Elsevier
• Subjects: Chemical thermodynamics; Chemistry; Elements, mineral and organic compounds; Exact sciences and technology; General and physical chemistry; Thermodynamic properties; Vapor pressure; Enthalpy; Sublimation; Bicyclic compound; Combustion; Experimental study; Oxygen heterocycle; Thermodynamic properties
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1006/jcht.1995.0123

The standard ( p ∘= 0.1 MPa) molar enthalpies of formation for crystalline 2-cyanoquinoline, 2-CN-C 9H 6N, and 3-cyanoquinoline, 3- CN - C 9H 6N, were derived from the standard molar enthalpies of combustion, in oxygen, at the temperature T= 298.15 K, measured by static bomb-combustion calorimetry; the Knudsen mass-loss effusion technique was used to measure the vapour pressures of the crystals as functions of temperature, and the standard molar enthalpies of sublimation, at T= 298.15 K, were derived by the Clausius-Clapeyron equation. Direct measurements of the standard molar enthalpies of sublimation, using microcalorimetry, for 2-cyanoquinoline and 3-cyanoquinoline confirmed the values from the Knudsen technique.