Journal of Physical Chemistry A, volume 115, issue 9, pages 1743-1753

Tautomerism and Thermal Decomposition of Tetrazole: High-Level ab Initio Study

Publication typeJournal Article
Publication date2011-03-10
Quartile SCImago
Q2
Quartile WOS
Q2
Impact factor2.9
ISSN10895639, 15205215
Physical and Theoretical Chemistry
Abstract
The mutual interconversion and decomposition reactions of four tetrazole isomers (1H-TZ, 2H-TZ, 5H-TZ, and an N-heterocyclic carbene 14H) have been studied theoretically using the W1 high-level procedure. Computations allowed resolution of the existing discrepancies in the mechanism and key intermediates of TZ thermolysis. The tautomeric equilibria between 1H-TZ, 2H-TZ, and 14H turned out to play a very important role in the mechanism of thermal decomposition. Although the barriers of monomolecular tautomeric transformations were found to be high (∼50-70 kcal/mol), the concerted double H atom transfer reactions in the H-bonded complexes of TZ tautomers have profoundly lower barriers (∼18-28 kcal/mol). These reactions lead to fast interconversion between 1H-TZ, 2H-TZ, and 14H. The carbene 14H has never been considered before; however, it was predicted to be a key intermediate in the mechanism of thermal decomposition of TZ. For all species considered, the unimolecular reactions of N(2) elimination were predicted to dominate over the elimination of hydrazoic acid. In agreement with existing experimental data, the effective activation energy of thermolysis was calculated to be 36.2 kcal/mol.

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Basova T. V., Cheblakov P. B., Gritsan N. Tautomerism and Thermal Decomposition of Tetrazole: High-Level ab Initio Study // Journal of Physical Chemistry A. 2011. Vol. 115. No. 9. pp. 1743-1753.
GOST all authors (up to 50) Copy
Basova T. V., Cheblakov P. B., Gritsan N. Tautomerism and Thermal Decomposition of Tetrazole: High-Level ab Initio Study // Journal of Physical Chemistry A. 2011. Vol. 115. No. 9. pp. 1743-1753.
RIS |
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RIS Copy
TY - JOUR
DO - 10.1021/jp112374t
UR - https://doi.org/10.1021/jp112374t
TI - Tautomerism and Thermal Decomposition of Tetrazole: High-Level ab Initio Study
T2 - Journal of Physical Chemistry A
AU - Cheblakov, Pavel B
AU - Basova, Tamara V.
AU - Gritsan, N.P
PY - 2011
DA - 2011/03/10 00:00:00
PB - American Chemical Society (ACS)
SP - 1743-1753
IS - 9
VL - 115
SN - 1089-5639
SN - 1520-5215
ER -
BibTex |
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BibTex Copy
@article{2011_Basova,
author = {Pavel B Cheblakov and Tamara V. Basova and N.P Gritsan},
title = {Tautomerism and Thermal Decomposition of Tetrazole: High-Level ab Initio Study},
journal = {Journal of Physical Chemistry A},
year = {2011},
volume = {115},
publisher = {American Chemical Society (ACS)},
month = {mar},
url = {https://doi.org/10.1021/jp112374t},
number = {9},
pages = {1743--1753},
doi = {10.1021/jp112374t}
}
MLA
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MLA Copy
Basova, Tamara V., et al. “Tautomerism and Thermal Decomposition of Tetrazole: High-Level ab Initio Study.” Journal of Physical Chemistry A, vol. 115, no. 9, Mar. 2011, pp. 1743-1753. https://doi.org/10.1021/jp112374t.
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