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Manuel A.V. Ribeiro da Silva Ana I.M.C. Lobo Ferreira Fabrice M. Maciel 《The Journal of chemical thermodynamics》2010,42(2):220-224
The present work is part of a research program on the energetics of the linear 4-n-alkoxybenzoic acids, aiming the study of the enthalpic effect of the introduction of an alkoxy chain in the position 4- of the benzoic acid ring. In this work, we present the results of the thermochemical research on 4-n-alkoxybenzoic acids with the alkoxy chain length n = 2, 4, and 8.The standard () molar enthalpy of formation of crystalline 4-ethoxybenzoic acid, 4-butoxybenzoic acid, and 4-(octyloxy)benzoic acid was measured, at T = 298.15 K, by static-bomb calorimetry. These values, combined with the values of standard molar enthalpies of sublimation, were used to derive the standard molar enthalpies of formation in the gaseous phase.
4-Alkoxybenzoic acid | |||
---|---|---|---|
4-Ethoxybenzoic acid | 4362.7 ± 1.3 | 605.5 ± 1.8 | 482.2 ± 2.0 |
4-Butoxybenzoic acid | 5677.3 ± 2.0 | 647.1 ± 2.5 | 518.1 ± 2.6 |
4-(Octyloxy)benzoic acid | 8269.0 ± 3.3 | 767.9 ± 3.9 | 604.9 ± 4.1 |
Empty Cell | |||
Calvet | Knudsen | ||
2-Furanacrylic acid (cr) | 3149.8 ± 0.5 | 103.0 ± 0.7 | 103.3 ± 0.5 |
3-Furanacrylic acid (cr) | 3151.5 ± 0.7 | 104.9 ± 1.1 | 106.8 ± 0.5 |
3-(2-Furyl)-2-propenal (cr) | 3425.7 ± 1.2 | 82.3 ± 0.4 | |
2-Furanacrylonitrile (l) | 3562.5 ± 1.3 | 65.2 ± 0.6 |
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