Li-Guo Kong, Z. Tan, Jie Xu
Dec 1, 2003
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0
Influential Citations
4
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Journal
The Journal of Chemical Thermodynamics
Abstract
Abstract Endo-Tricyclo[5.2.1.02,6]decane (CAS 6004-38-2) is an important intermediate compound for synthesizing diamantane. The lack of data on the thermodynamic properties of the compound limits its development and application. In this study, endo-Tricyclo[5.2.1.02,6]decane was synthesized and the low temperature heat capacities were measured with a high-precision adiabatic calorimeter in the temperature range from (80 to 360) K. Two phase transitions were observed: the solid–solid phase transition in the temperature range from (198.79 to 210.27) K, with peak temperature 204.33 K; the solid–liquid phase transition in the temperature range from 333.76 K to 350.97 K, with peak temperature 345.28 K. The molar enthalpy increments, ΔHm, and entropy increments, ΔSm, of these phase transitions are ΔHm=2.57 kJ · mol−1 and ΔSm=12.57 J · K−1 · mol−1 for the solid–solid phase transition at 204.33 K, and, ΔfusHm=3.07 kJ · mol−1 and ΔfusSm=8.89 J · K−1 · mol−1 for the solid–liquid phase transition at 345.28 K. The thermal stability of the compound was investigated by thermogravimetric analysis. TG result shows that endo-Tricyclo[5.2.1.02,6]decane starts to sublime at 300 K and completely changes into vapor when the temperature reaches 423 K, reaching the maximal rate of weight loss at 408 K.