Coupled cluster, B2PLYP and M06-2X investigation of the thermochemistry of five-membered nitrogen containing heterocycles, furan, and thiophene

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Coupled cluster, B2PLYP and M06-2X investigation of the thermochemistry of five-membered nitrogen containing heterocycles, furan, and thiophene

Tema

TERMODINAMICA
HETEROCICLOS
BIBLIOGRAFIA NACIONAL QUIMICA
2011

Abstract

Herein, the thermochemical properties of fivemembered rings heterocycles were studied employing the CCSD(T) methodology coupled with the correlation consistent basis sets and including corrections for relativistic and core-valence effects as well as anharmonicities of the potentials. For pyrrole, furan, imidazole, pyrazole, 1H- 1,2,4-triazole, and 1H-tetrazole, the mean absolute deviation (MAD) of the DHo f;298, computed at the CCSD(T) level, is 0.5 kcal/mol with respect to the experimental values. In the case of 1H-1,2,3-triazole, 2H-1,2,3-triazole, 4H-1,2,3- triazole, 4H-1,2,4-triazole, 2H-tetrazole, and pentazole, we propose the following DHo f;298: 62.6, 59.2, 85.0, 54.2, 77.7, and 107.5 kcal/mol, respectively. For thiophene, we revisit our previous result and propose a value of 26.0 kcal/mol. The theoretical estimations were used to study the performance of the M06-2X and B2PLYP functionals. Also, the convergence toward the complete basis set limit (CBS) was analyzed. M06-2X did not show a smooth convergence toward the CBS limit. Particularly, for the cc-pVTZ and ccpVQZ basis sets, some problems were detected. Yet, along the cc-pVQZ, cc-pV5Z, and cc-pV6Z basis sets, the TAE smoothly decreased. The diminution of the TAE upon increase in basis set was not expected because the opposite behavior is more frequently observed. The MAD of the total atomization energies determined at the M06-2X level was 0.42 kcal/mol, with respect to the CCSD(T) results. In the case of the double hybrid B2PLYP functional, a smooth convergence toward the CBS limit was detected, even though the performance seriously degradated when the basis set was increased. At the CBS limit, the MAD with respect to the CCSD(T) TAEs was 8.26 kcal/mol.

Fuente

Theoretical Chemistry Accounts v. 129, no. 2, 2011. -- p. 219-227

Editor

Springer

Fecha

2011

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Identificador

DOI 10.1007/s00214-011-0922-z
Fecha de agregación
August 21, 2013
Colección
Bibliografía Nacional Química
Tipo de Elemento
Document
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,
Citación
Denis, Pablo A., “Coupled cluster, B2PLYP and M06-2X investigation of the thermochemistry of five-membered nitrogen containing heterocycles, furan, and thiophene,” RIQUIM - Repositorio Institucional de la Facultad de Química - UdelaR, accessed July 23, 2024, https://riquim.fq.edu.uy/items/show/772.
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