Thermodynamic study on the sublimation of six methylnitrobenzoic acids

Thermodynamic study of the sublimation of six halobenzoic acids

“…[15] 110.9 ± 1.1 105.0 ± 1.1 107.6 ± 1.1 Skinner and co-workers [16] 105.8 107.9 Tan and Sabbah [18] 95.9 ± 0.4 99.2 ± 0.2 103.1 ± 0.6 Sabbah and Hirtz [19] 100.9 ± 0.4 101.4 ± 0.3 102.5 ± 0.4 Holdiness [17] 116. 2 (14) and (15). …”

“…The present work is a continuation of a thermodynamic study of our laboratory on the sublimation of several substituted benzoic acids recently published [1][2][3][4], which included the fluorobenzoic and iodobenzoic acids [1]. In order to study the influence of the halogen substituent on the volatility of the different halobenzoic acids, it was decided to extend the previous study to the three chlorobenzoic and to the three bromobenzoic acids for which vapour pressure-temperature data were not known.…”

Vapor pressures and standard molar enthalpies, entropies, and Gibbs free energies of sublimation of 2,4- and 3,4-dinitrobenzoic acids

“…Despite a great interest has been devoted to the different research areas involving the 3,5-dinitrobenzoic acid, the only thermochemical data available in the literature on nitrobenzoic derivatives is concerning the mono-and di-substituted nitro benzoic acids [10][11], and, to the best of our knowledge, no relevant studies were published on dinitrobenzoic acids (DNBAs), except for two early papers written by Lebedeva et al [12] and Verkade [13].…”

“…were calculated for 2,4-DNBA and 3,4-DNBA, respectively, by adding the increments (28.6 ± 2.2) kJ Á mol -1 and (19.9 ± 2.1) kJ Á mol -1 for the substituent nitro in the positions 2-and 3-, respectively, to the value D g cr H m ð298:15 KÞ ¼ ð117:7 AE 2:6ÞkJ Á mol À1 selected for 4-nitrobenzoic acid [11]. Taking into account the uncertainty intervals assigned the averages of the experimental values do not perfectly agree with the calculated values, being the former 9-12 kJ Á mol -1 lower than the latter.…”

Thermodynamic study of the sublimation of six aminomethylbenzoic acids

“…(1) In order to test this scheme for other substituted methylbenzoic acids, a similar study on the sublimation of six aminomethylbenzoic acids (for which there were no published experimental results) is presented in this work. The standard molar enthalpies, entropies and Gibbs energies of sublimation of the crystalline compounds were derived from vapour pressure measurements at different temperatures by means of the Knudsen effusion method.…”