doi:10.1006/jcht.2001.0857 Available online at http://www.idealibrary.com on J. Chem. Thermodynamics 2001, 33, 1405–1418 An experimental system for measurement of enthalpies of sublimation by d.s.c. Aar´ on Rojas-Aguilar, a Eulogio Orozco-Guare ˜ no, and Melchor Mart´ ınez-Herrera Departamento de Qu´ ımica del Centro de Investigaci´ on y de Estudios Avanzados del I.P.N.,Av. Instituto Polit´ ecnico Nacional 2508, Col. San Pedro Zacatenco, M´ exicoD.F. C.P. 07360 The sensor and control devices of a d.s.c.-7 Perkin Elmer differential scanning calorimeter have been incorporated into a system for measurement of enthalpies of sublimation. The system was tested with four sublimation reference substances: naphthalene, iodine, benzoic acid and ferrocene between the temperatures 298.15 K and 333.15 K and at constant pressure giving the following results: Substance  sub H m (T ) kJ · mol −1  sub H m (298.15 K) kJ · mol −1 Naphthalene 71.70 ± 1.27 (T = 298.15 K) 71.70 ± 1.27 Iodine 60.64 ± 1.72 (T = 313.15 K) 60.90 ± 1.72 Benzoic acid 86.79 ± 0.53 (T = 333.15 K) 88.47 ± 0.53 Ferrocene 71.84 ± 1.38 (T = 333.15 K) 73.12 ± 1.38 The precision was greater than 1.9 per cent except for iodine for which some experimental difficulties increased the uncertainty. This system will find future application in the determination of the enthalpy of sublimation of the organic compounds that are being studied in the laboratory. c  2001 Academic Press KEYWORDS: enthalpy of sublimation; differential scanning calorimetry; naphthalene; iodine; benzoic acid; ferrocene 1. Introduction The enthalpy of sublimation is one of the most useful quantities in thermochemical research, its magnitude is directly related to the intermolecular interactions in a crystalline arrangement and make possible, with the enthalpies of formation in the solid state, the calculation of the enthalpies of formation of chemical compounds in the gas phase. This a To whom correspondence should be addressed (E-mail: arojas@mail.cinvestav.mx.). 0021–9614/01/101405 + 14 $35.00/0 c  2001 Academic Press