Add time:07/24/2019         Source:sciencedirect.com

The standard (po=0.1 MPa) molar enthalpies of formation for crystalline 2-chloro-4-nitroaniline and 2-chloro-5-nitroaniline were derived from the standard molar enthalpies of combustion, in oxygen, at the T=298.15 K, measured by rotating bomb combustion calorimetry. The Knudsen mass-loss effusion technique was used to measure the vapour pressures of the crystals as function 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 Calvet microcalorimetry, for 2-chloro-4-nitroaniline and 2-chloro-5-nitroaniline confirmed the values derived from the Knudsen technique. ΔfHm0 (cr)ΔcrgHm0(kJ · mol−1)(kJ · mol−1)CalvetKnudsen2-Chloro-4-nitroaniline (2-Cl-4-NO2-C6H3NH2)−74.9 ± 1.4101.8 ± 1.8102.6 ± 1.52-Chloro-5-nitroaniline (2-Cl-5-NO2-C6H3NH2)−71.0 ± 1.5100.3 ± 2.2101.0 ± 1.6

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