Thermal decomposition of ammonia borane at 357 K

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• 作者：A. V. Butlak ; Yu. V. Kondrat’ev ; A. S. Mazur…
• 关键词：ammonia borane ; thermal decomposition ; calorimetry ; solid ; state NMR
• 刊名：Russian Journal of General Chemistry
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：85
• 期：11
• 页码：2505-2508
• 全文大小：210 KB
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• 作者单位：A. V. Butlak (1)
  Yu. V. Kondrat’ev (1)
  A. S. Mazur (1)
  A. Yu. Timoshkin (1)
  
  1. St. Petersburg State University, Universitetskaya nab. 7–9, St. Petersburg, 199034, Russia
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Chemistry
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1608-3350

文摘

The heat effect of ammonia borane decomposition at 357 K under atmospheric pressure in glass and copper cells has been determined by calorimetry. The enthalpy of BH₃NH₃ heat-induced decomposition in glass ampoules is of–24.8±2.3 kJ/mol; this value includes the structural reorganization into diammoniate of diborane of–4.0±2.8 kJ/mol and the thermal effect of decomposition into polyamidoborane of–20.8±1.6 kJ/mol. In the case of experiments in copper cells a much higher (–47.6±8.3 kJ/mol) heat evolution is observed. The solidstate 15N and 11B NMR analysis of samples after the calorimetric experiment has shown that partial oxidation of the sample into boric acid occurs in copper cells. Keywords ammonia borane thermal decomposition calorimetry solid-state NMR