The enthalpy of sublimation of cubane

The  sublimation   enthalpy  of  cubane , a key reference material for force field and quantum mechanical computations, was measured by combining the vaporization enthalpy at  T  = 298.15 K to the sum of the fusion enthalpy measured at  T  = 405 K and a  solid–solid phase transition  that occurs at  T  = 394 K. The fusion and solid–solid phase transitions were measured previously. A sublimation enthalpy value of (55.2 ± 2.0) kJ mol −1  at  T  = 298.15 K was obtained. This value compares quite favorably the value obtained by comparing the sublimation enthalpy of similar substances as a function of their  molar masses  but is at odds with earlier measurements.