Pyrolysis of tetrasulfur tetraimide.

概要

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Tetrasulfur tetraimide was pyrolyzed into sulfur, tetrasulfur tetranitride, tetrasulfur dinitride, ammonia, and nitrogen even below its apparent melting point, 143 °C, under atmospheric pressure; a small amount of hepta-sulfur imide was also observable. The tetrasulfur dinitride and nitrogen were formed from subsequent reactions between products. The overall pyrolysis consisted of the primary decomposition and the following subsequent ones, as judged from the stoichiometric relationships among the pyrolytic products: 3S4(NH)4=4S+2S4N4+4NH3, S4N4=S4N2+N2 (in the presence of sulfur), and S4N2=4S+N2. Partial pressures of ammonia at the primary pyrolysis were estimated to be 8.5×10−2, 2.1×10−1, 5.2×10−1, and 1.4 Pa at 60, 70, 80, and 90 °C respectively.
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