The molecular geometry of 2,6 - diamino - 3,5 - dinitropyrazine - 1 - oxide
(LLM - 105) was optimized at B3LYP/6 - 31G** level. The population, vibrat
ional frequency, bonding behavior and natural bond orbital analyses were pe
rformed. According to the results, all atoms of LDI - 105 are coplanar and
the molecule is constituted by a pi conjugative system except H; intensive
intramolecular hydrogen bonds are involved in LLM - 105, which increase the
stability of the whole molecule; the C-N bond in C-NO2 with the smallest b
ond intensity was considered as the induced bond of thermal decomposition i
n LLM - 105.