Amides and Imides -NH2, NH

The reaction enthalpy AH is around 83.68 kJ moH. The calculated weight loss from the above reaction is about 37%. However, when HNH2 is in contact with LiH, the reaction path changes completely. When LiNH2 + LiH is used, H 2 is released at a much lower temperature and imide is formed  

The reaction enthalpy AH is around 45 kJ moH. In this case, the weight loss was calculated to be 6.5%. When LiNH2 + 2LiH was used, H2 and an imide-like structure formed at temperatures below 320 °C and H2 and Li3N formed at higher temperatures  

The reaction heat of the first stage is estimated to be much less than 83 kJ moH the overall reaction heat is around 161 kJ moH. At temperatures below 320 °C, 6.5 mass% H2 was released, which equals the theoretical value of 7.0 mass%. Thus, the intermediate structure Li NH3. has the formula Li2.2NH0.8- It might be treated as an Li-rich imide. 

The combination of hydrides where the hydrogen is partially positive charged with hydrides where the hydrogen is partially negative charged leads to destabilization of the hydrides. 

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Amides and Imides (—NH2, = NH) The thermal hydrogen desorption from lithium amide (LiNH2) was investigated by Chen et al. [41, 42]. The thermal desorption of pure lithium amide mainly evolves NH3 at elevated... 

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