Thermodynamic properties of 1-bromoadamantane in the condensed state and molecular disorder in its crystals

Six-membered ring aliphatic compounds: A search for regularities in phase transitions

“…A peculiarity of 1-Br-adamantane is that this compound exhibit the solid-solid phase transition at 311.6 K. Thus, the experimental vapor pressures were measured above this temperature for crystalline phase I as well as above crystalline phase II in the temperature range below the solid to solid phase transition temperature. A remarkable consistency of phase transition results measured by Knudsen-effusion, sublimation calorimetry, and DSC was demonstrated by Bazyleva et al [11].…”

“…For the same reason vapor pressures of 2-Cladamantane from this work are not directly comparable (see Figure S2) with the results measured with the mass loss Knudsen effusion method [15]. In order to get more confidence in our transpiration results we have deliberately performed measurements on the 1-Br-adamantane in the temperature range where reliable data from Knudsen-effusion as well as direct calorimetric methods were available [11]. A peculiarity of 1-Br-adamantane is that this compound exhibit the solid-solid phase transition at 311.6 K. Thus, the experimental vapor pressures were measured above this temperature for crystalline phase I as well as above crystalline phase II in the temperature range below the solid to solid phase transition temperature.…”

“…Solid-state phase transitions of halogen-substituted adamantanes below the reference temperature 298.15 K has been a popular endeavor in the recent literature. Calorimetric studies of 1-Cl-adamantane [7,8], 2-Cl-adamantane [9,10], 1-Br-adamantane [7,[11][12][13], and 2-Br-adamantane [10] are already published in the literature and the available enthalpies of phase transitions are mostly in agreement within 1 kJ·mol -1 . In contrast, the solid-gas phase transitions of halogen-substituted adamantanes are reported only in three papers [11,[14][15] and reported sublimation enthalpies seem to be in disarray.…”

Thermodynamic properties of tert-butylbenzene and 1,4-di-tert-butylbenzene

“…A summary of the calculations is provided here in cooperation with the researchers, who did the analysis and calculations [9,36]. Publication of full details for the calculations for all seven compounds treated with statistical methods is planned [37].…”

Relationship between the two-component system 1-Br-adamantane + 1-Cl-adamantane and the high-pressure properties of the pure components

“…1-BrA and 1-ClA were purchased from Aldrich with purity of 99% and 98% (as summarized in the Supplementary Material in Table S1), respectively, and used as received since the measured phase transition and melting points agreed well with those previously reported [30,31]. Two-component mixtures were prepared from the melt of the materials in the selected proportions and fast cooling to room temperature.…”