The pyrolysis of heptathiazocine.

概要

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Heptathiazocine was pyrolyzed into ammonia, tetrasulfur tetranitride, and tetrasulfur dinitride above 383 K in an argon atmosphere; then, the latter two intermediates finally degraded into sulfur and nitrogen. According to the stoichiometric correlation among the final pyrolytic products, an overall pyrolysis can be expressed as: S7NH=7/8 S8+1/3 N2+1/3 NH3. The differential scanning calorimetry of heptathiazocine gave the standard enthalpy of the formation as 89.3±1.1 kJ mol−1 by combining the enthalpy change of the pyrolysis with its molar heat capacity and known thermodynamic data of the concerned species. The standard enthalpies of the formation of this compound were also calculated as being 93 and 91 kJ mol−1 on the basis of Sanderson's method, assuming that hydrogen bonds were negligible in the crystal (which were comparable to that observed in this work).
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