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Enthalpies of combustion, vapour pressures, and enthalpies of sublimation of 5-, 6-, and 8-nitroquinoline and 8-nitroquinaldine

✍ Scribed by Manuel A.V. Ribeiro da Silva; M.Agostinha R. Matos; Luı́sa M.P.F. Amaral

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
218 KB
Volume
29
Category
Article
ISSN
0021-9614

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✦ Synopsis

The standard ( p°= 0.1 MPa) molar enthalpies of formation DfH°m for crystalline 5-, 6-, 8-nitroquinoline and 8-nitroquinaldine were derived from the standard molar enthalpies of combustion in oxygen at T = 298.15 K DcH°m, 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, D g cr H o m were derived by the Clausius-Clapeyron equation. Direct measurements of the standard molar enthalpies of sublimation, using microcalorimetry, for 5-, 6-, 8-nitroquinoline, and 8-nitroquinaldine confirmed the values from the Knudsen technique.

mol -1 ) Calvet Knudsen 5-nitroquinoline 4508.3 2 2.2 92.2 2 2.0 94.2 2 0.7 6-nitroquinoline 4487.4 2 1.8 99.3 2 2.4 103.8 2 1.0 8-nitroquinoline 4499.3 2 2.1 101.8 2 1.4 106.7 2 0.9 8-nitroquinaldine 5133.8 2 1.9 107.3 2 4.4 111.0 2 0.8

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