Some thermophysical properties of several solid aldehydes

Thermodynamic study on hydroxybenzaldehyde derivatives: 3- and 4-Hydroxybenzaldehyde isomers and 3,5-di-tert-butyl-2-hydroxybenzaldehyde

“…(11) and (12) show that the enthalpic increments for the entrance of two tert-butyl groups in positions 3-and 5-of 2-hydroxybenzaldehyde and of catechol, have the same values, which enhance the consistency of our experimental results. …”

“…For 4HBA, Temprado et al [12] reported the value C p;m ðgÞ cr ¼ 149:9 J Á K À1 Á mol À1 at the temperature 298.15 K. Using a group additive scheme, represented by equation (5) Considering the values for the heat capacities in the gaseous and crystalline phase, the value D g cr C p;m ðhÞ ¼ À17:4 J Á K À1 Á mol À1 is obtained. Inserting the value C p;m ðgÞ cr ¼ 149:9 J Á K À1 Á mol À1 in equation (6), proposed by Chickos et al [30], the value D g cr C p;m ðhÞ ¼ À20:6 J Á K À1 Á mol À1 is derived and inserting the value C p;m ðgÞ ¼ 132:5 J Á K À1 Á mol À1 in equation (7) [31], which is just a rearrangement of equation (6), the value D g cr C p;m ðhÞ ¼ À24:…”

“…was performed. A power compensated differential scanning calorimeter Setaram DSC 141 was used to scan the samples, under a heating rate of 2 K Á min À1 , from T = 298 K up to a temperature near the fusion temperature of each compound (3HBA, T fusion = (373 to 376) K [11]; 4HBA, T fusion = (390.8 ± 0.1) K [12]; 3,5DTBHBA, T fusion = (332 to 334) K [11]). In each experiment, about 10 mg of the crystalline sample was sealed inside an aluminium crucible.…”

Interplay of thermochemistry and Structural Chemistry, the journal (volume 19, 2008) and the discipline

“…As revealed, the packing of the molecules in the crystal lattice is stabilized by intermolecular C-HÁÁÁO contacts in the herringbone arrangement. Thermophysical properties of the related 3,4-dimethoxybenzaldehyde have been recently reported [167].…”

Thermal behavior and polymorphism in medium–high temperature range of the sulfur containing amino acids l-cysteine and l-cystine

“…For several years, we have been involved in the experimental determination of the enthalpies of fusion, heat capacities and the study of polymorphism of pure organic molecules [23][24][25][26][27][28][29][30]. Very recently we have carried out [31] a thermochemical study of L-cysteine and L-cystine reporting their molar enthalpies of formation.…”