Abstract
Heats of formation (∆H f ) of various nitro-substituted azoles were predicted by Gaussian-4 MP2 combining with systematic fragmentation method (SFM), G4MP2-SFM. The overall mean absolute deviations and root-mean-square deviations of the particular opt-G4SFM(1,2) scheme are 2.0 and 2.6 kcal/mol, respectively, on the predictions of 48 molecules. Overall, each additional nitrogen in the azole ring increases ∆H f by 10–30 kcal/mol. While the effect of the NO2 substitution to carbon (NO2(C)) is minor, that to nitrogen (NO2(N)) increases ∆H f by 15–32 kcal/mol. In addition, we found that second-neighbor contribution is also significant for nonbonding interactions between NO2 groups, which increase ∆H f by 3–4 kcal/mol.
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This work was supported by the Agency for Defense Development and by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (Nos. 2007-0056341 and 2012-0004812).
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Rashid, M.A.M., Cho, S.G., Choi, T.H. et al. Heat of formation predictions of various nitro-substituted azoles by G4MP2-SFM scheme. Theor Chem Acc 134, 126 (2015). https://doi.org/10.1007/s00214-015-1733-4
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DOI: https://doi.org/10.1007/s00214-015-1733-4