Enthalpies of sublimation and vapour pressures of 14 amino acids and peptides

Vapour pressures and the enthalpies and entropies of sublimation of five dicarboxylic acids

“…In previous work, (12) we found that, for a series of about 70 different organic compounds measured by using the Knudsen effusion method, a linear correlation could be established between the enthalpy of sublimation and the temperature T ( p = 0.5 Pa) at which the vapour pressure of the crystals is p = 0.5 Pa. This series of compounds includes seven hydroxyquinolines, (7,8) six halohydroxyquinolines, (9) 11 polycyclic hydrocarbons, (13) 14 aminoacids and peptides, (14) benzophenone, (15) four substituted quinones, (16) and 28 organic compounds containing nitrogen, oxygen, and sulphur. (17) The obtained correlation:…”

Revision of standard molar enthalpies of formation of glycine and l-alanine in the gaseous phase on the basis of theoretical calculations

“…The last value was obtained using the values of D g cr H m (L-alanine, 434 K) = 134.4 kJ Á mol À1 (mean of values in references [27,32,34]), C p;m (L-alanine, cr, 298.15 K) = 118.7 J Á K À1 Á mol À1 (mean of values in references [36,38]), and C p;m (L-alanine, g, 298.15 K) = 112.6 J Á K À1 Á mol À1 calculated in this work. As is seen, the recommended value is in good agreement with the theoretical G3X result, À427.6 ± 4.0 kJ Á mol À1 .…”

“…d ''Best value" selection of the authors[29] is based on available 11 experimental measurements. e Weighted mean of values in references[27,31,32,34] corrected to 298.15 K.…”

Vapour pressures and standard molar enthalpies of sublimation of seven crystalline copper(II) β-diketonates. The mean molar (Cu-O) bond-dissociation enthalpies

“…Eventual processes of decomposition, dissociation, or association of the sample molecules, in the vapour phase, could be detected because then the ratio p m /p t is significantly different from unity. (8,9) SPINNING-ROTOR FRICTION GAUGE…”