Measurement of enthalpies of sublimation by drop method in a Calvet type calorimeter: design and test of a new system

Standard molar enthalpies of formation of three N-benzoylthiocarbamic-O-alkylesters

“…The standard molar enthalpies of sublimation were measured using the ''vacuum sublimation'' drop microcalorimetric method [22,23]. Samples of about 5 mg of each compound, contained in thin glass capillary tubes and sealed at one end, were dropped from room temperature into the hot reaction vessel in the Calvet High Temperature Microcalorimeter (SETARAM HT 1000D), held at the temperature T ¼ 375 K and then removed from the hot zone by vacuum sublimation.…”

“…The temperature was measured in situ using a small size Pt100 probe previously calibrated against a SPRT (25 X)Tinsley 5187SA standard probe using an ASL bridge F26. The dependency of the blank tube sign from the mass difference of the blank tubes in the reference and measuring cell was taken into account [23]. Table 1 lists typical combustion results for each compound in which Dm (H 2 O) is the deviation of the mass added to the calorimeter from 4059.0 g, the mass assigned to e(calor), and DU R is the correction to the standard state.…”

Standard molar enthalpy of formation of monothiodibenzoylmethane by rotating-bomb calorimetry

“…In the present work the enthalpies of sublimation, of monothiodibenzoylmethane and dibenzoylmethane were measured using the vacuum sublimation microcalorimetric technique [18,19]. Samples of about 5 mg contained in thin glass capillary tubes sealed at one end were dropped from room temperature into the hot-zone of the Calvet high temperature microcalorimeter and removed from the hot-zone by vacuum sublimation.…”

“…The calorimeter was calibrated in situ making use of the reported enthalpy of sublimation of naphthalene (72.600 AE 0.600) kJ Á mol À1 [17]. The mass difference of the blank tubes in the reference and sample cell was taken into account [19]. Table 1 lists typical combustion results for each compound in which Dm (H 2 O) is the deviation of the mass added to the calorimeter from 6900.0 g, the mass assigned to e(calor), and DU R is the correction to the standard state.…”

Upgraded sublimation energy determination procedure for icy films

“…Santos et al [3] determine this energy directly by means of calorimetry during the phase transition. Indirect methods measure a parameter related to the sublimation energy.…”