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Theoretical Study on Thermodynamic and Detonation Properties of Polynitrocubanes
Author(s) -
Ju XueHai,
Wang ZunYao
Publication year - 2009
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.200800007
Subject(s) - detonation , cubane , detonation velocity , nitro , explosive material , gibbs free energy , substituent , chemistry , standard enthalpy of formation , density functional theory , group (periodic table) , thermodynamics , basis set , crystallography , computational chemistry , stereochemistry , crystal structure , physics , organic chemistry , alkyl
We investigated the heat of formation (Δ f H ) of polynitrocubanes using density functional theory B3LYP and HF methods with 6‐31G*, 6‐311+G**, and cc‐pVDZ basis sets. The results indicate that Δ f H firstly decreases (nitro number m =0–2) and then increases ( m =4–8) with each additional nitro group being introduced to the cubane skeleton. Δ f H of octanitrocubane is predicted to be 808.08 kJ mol −1 at the B3LYP/6‐311+G** level. The Gibbs free energy of formation (Δ f G ) increases by about 40–60 kJ mol −1 with each nitro group being added to the cubane when the substituent number is fewer than 4, then Δ f G increases by about 100–110 kJ mol −1 with each additional group being attached to the cubic skeleton. Both the detonation velocity and the pressure for polynitrocubanes increase as the number of substituents increases. Detonation velocity and pressure of octanitrocubane are substantially larger than the famous widely used explosive cyclotetramethylenetetranitramine (HMX).