Maurizio D`Auria* Pages 33 - 43 ( 11 )
Background: Recently, the author of the article proposed a new index for the estimation of the aromatic character. The aromaticity index D, D usually obtained by using DFT/B3LYP/6-311G+(d,p) theoretical method.
Method: The D index was tested using different functionals: LSDA, BVP86, B3LYP, CAM-B3LYP, B3PW91, mPW1PW91, PBEPBE, HSE1PBE, HCTH, TPSSTPSS, and wB97XD.
Results: The results showed that the D values for monocyclic aromatic compounds are not largely sensible to the variation of the functional. Large variations of D values were observed for polycyclic aromatic compounds. D values were correlated to ERE (experimental resonance energy) and ASE (aromatic stabilization energy). ERE and ASE gave different correlations with D.
Conclusion: The best correlation between D and ERE was obtained by using CAM-B3LYP. The best correlation between D and ASE was obtained by using CAM-B3LYP.
Aromatic stabilization energy, aromaticity, DFT calculations, experimental resonance energy, functionals, π orbitals.
Dipartimento di Scienze, Università della Basilicata, Viale dell'Ateneo Lucano 10, 85100 Potenza