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Citation: ZENG Xiu-Lin, CHEN Wang-Hua, LIU Jia-Cong. Theoretical Studies on the Molecular Structure, Electronic Structure and Heats of Formation of Explosive Sensitizers[J]. Acta Physico-Chimica Sinica, ;2007, 23(02): 192-197. doi: 10.1016/S1872-1508(07)60015-1 shu

Theoretical Studies on the Molecular Structure, Electronic Structure and Heats of Formation of Explosive Sensitizers

1.
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China

Received Date: 21 June 2006
Available Online: 30 January 2007

Quantum chemical calculations at the HF/6-31G* and B3LYP/6-31G* levels have been carried out on five explosive sensitizers: ethyl nitrate (EN), n-propyl nitrate (NPN), isopropyl nitrate (IPN), 2-ethylhexyl nitrate (EHN), and tetraethylene glycol dinitrate (TEGDN). Theoretical studies have yielded a wealth of quantum chemical information on the molecular geometries, electronic structures, and energies of the title compounds. On the basis of the Mulliken populations and bond lengths, the O2—N3 fission is acceptable. Charge distribution analysis indicated that the five nitrates produced NO2 gas during the dissociation of the O2—N3 weak bond. The relative thermal stability ordering of the five nitrates was estimated on the basis of the frontier orbital energy (EHOMO, ELUMO) and the energy gap (ΔE). The heats of formation (HOFs) of the five sensitizers, EN, IPN, NPN, EHN, and TEGDN, were calculated from the isodesmic reactions and were -155.972, -190.896, -175.279, -272.376, and -790.733 kJ·mol-1, respectively.
- Explosive sensitizers,
- Mulliken population,
- Frontier orbital energy,
- Heat of formation (HOF),
- Isodesmic reaction
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