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Citation: WANG Luo-Xin, LIU Yong, TUO Xin-Lin, LI Song-Nian, WANG Xiao- ng. Effect of H⁺ and NH⁺₄ on the N—NO₂ Bond Dissociation Energy of HMX[J]. Acta Physico-Chimica Sinica, ;2007, 23(10): 1560-1564. doi: 10.3866/PKU.WHXB20071013 shu

Effect of H⁺ and NH⁺₄ on the N—NO₂ Bond Dissociation Energy of HMX

1.
Institute of Polymer Science and Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, P. R. China

Received Date: 11 May 2007
Available Online: 13 July 2007

The structure of β-HMX and several complexes with H⁺ or NH^+₄were optimized using the density functiona theory(DFT)at the B3P86/6-31G** level. Meanwhile, the bond dissociation energies of the weakest N—NO₂ for β-HMX and the complexes were obtained by the same calculation method. It was found that the geometrical configuration of the HMX in the complexes differed significantly from that of β-HMX. On the other hand, one of the N—NO₂ bonds of HMX was activated due to the combination of H⁺ with HMX, but this activation was unobvious for the complexes with NH^+₄ . The N—NO₂ bond dissociation energies of two complexes with H⁺ decreased about 20 and 82 kJ·mol^-1, respectively, in comparison with that of β-HMX. However, the N—NO₂ bond dissociation energy for the complex with NH^+₄ decreased only about 8 kJ·mol^-1. It indicated that the H⁺ could promote the initial thermal decomposition of N—NO₂ bond of β-HMX, but this initial decomposition was slightly influenced by NH^+₄.
- HMX; Bond dissociation energy; Thermal decomposition; DFT
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沈阳化工大学材料科学与工程学院沈阳 110142

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Effect of H⁺ and NH⁺₄ on the N—NO₂ Bond Dissociation Energy of HMX