Constructing Homodesmic Reactions for Calculating the Enthalpies of Formation of Organic Compounds
- Авторы: Khursan S.1, Ismagilova A.2, Akhmerov A.2, Spivak S.2,3
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Учреждения:
- Ufa Institute of Chemistry
- Bashkir State University
- Institute of Petrochemistry and Catalysis
- Выпуск: Том 90, № 4 (2016)
- Страницы: 796-802
- Раздел: Structure of Matter and Quantum Chemistry
- URL: https://journals.rcsi.science/0036-0244/article/view/168044
- DOI: https://doi.org/10.1134/S0036024416030201
- ID: 168044
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Аннотация
The mathematics and software of the homodesmic approach to calculating enthalpies of formation ΔfH° of organic compounds are described. The program generates a set of independent homodesmic reactions for a studied compound, increasing the reliability of theoretical determinations of the standard enthalpy of formation. The basic steps of program construction, using the algorithm to determine the basis of homodesmic reactions for organic compounds, and calculations for the enthalpies of formation for a random test set comprising 53 CHNO-containing organic compounds of different classes are described. It is shown that the homodesmic approach provides highly reliable theoretical values of ΔfH° virtually regardless of the quantumchemical approach that is used. The average absolute error of MAD calculations for ΔfH° of a test set is 2.2 kJ/mol for the simple B3LYP/6-31G(d) approach and 2.1 kJ/mol for the moderately complicated M06-2X/cc-pVTZ approach, while using the complicated method of G3 calculations reduces the MAD value to 1.7 kJ/mol.
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Об авторах
S. Khursan
Ufa Institute of Chemistry
Автор, ответственный за переписку.
Email: khursansl@gmail.com
Россия, Ufa, 450054
A. Ismagilova
Bashkir State University; Bashkir State University
Автор, ответственный за переписку.
Email: ismagilovaas@rambler.ru
Россия, Ufa, 450076; Neftekamsk Branch, Neftekamsk, 452681
A. Akhmerov
Bashkir State University
Email: ismagilovaas@rambler.ru
Россия, Ufa, 450076
S. Spivak
Bashkir State University; Institute of Petrochemistry and Catalysis
Email: ismagilovaas@rambler.ru
Россия, Ufa, 450076; Ufa, 450075