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Accurate prediction of the enthalpies of formation for xanthophylls
Author(s) -
Lii JennHuei,
Liao FuXing,
Hu ChingHan
Publication year - 2011
Publication title -
journal of computational chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.907
H-Index - 188
eISSN - 1096-987X
pISSN - 0192-8651
DOI - 10.1002/jcc.21899
Subject(s) - density functional theory , xanthophyll , chemistry , basis set , molecule , standard enthalpy of formation , thermodynamics , consistency (knowledge bases) , computational chemistry , mathematics , carotenoid , physics , organic chemistry , food science , geometry
This study investigates the applications of computational approaches in the prediction of enthalpies of formation (Δ H f ) for C‐, H‐, and O‐containing compounds. Molecular mechanics (MM4) molecular mechanics method, density functional theory (DFT) combined with the atomic equivalent (AE) and group equivalent (GE) schemes, and DFT‐based correlation corrected atomization (CCAZ) were used. We emphasized on the application to xanthophylls, C‐, H‐, and O‐containing carotenoids which consist of ∼ 100 atoms and extended π‐delocaization systems. Within the training set, MM4 predictions are more accurate than those obtained using AE and GE; however a systematic underestimation was observed in the extended systems. Δ H f for the training set molecules predicted by CCAZ combined with DFT are in very good agreement with the G3 results. The average absolute deviations (AADs) of CCAZ combined with B3LYP and MPWB1K are 0.38 and 0.53 kcal/mol compared with the G3 data, and are 0.74 and 0.69 kcal/mol compared with the available experimental data, respectively. Consistency of the CCAZ approach for the selected xanthophylls is revealed by the AAD of 2.68 kcal/mol between B3LYP‐CCAZ and MPWB1K‐CCAZ. © 2011 Wiley Periodicals, Inc. J Comput Chem, 2011