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  Equilibrium Structures of Pyrazine, s-Triazine, and s-Tetrazine

Breidung, J., & Thiel, W. (2019). Equilibrium Structures of Pyrazine, s-Triazine, and s-Tetrazine. The Journal of Physical Chemistry C, 123(13), 7940-7951. doi:10.1021/acs.jpcc.8b07326.

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jp8b07326_si_001_pub 629.pdf (Supplementary material), 242KB
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Breidung, Jürgen1, Author              
Thiel, Walter1, Author              
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1Research Department Thiel, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445590              

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 Abstract: In recent years, accurate equilibrium (re) structures have been determined for pyridine, pyridazine, and pyrimidine. Here, we report accurate re structures for the structurally related molecules pyrazine, s-triazine, and s-tetrazine, which were obtained using a composite approach based on explicitly correlated coupled-cluster theory (CCSD(T)-F12b) in conjunction with a large correlation-consistent basis set (cc-pCVQZ-F12) to take core–valence electron correlation into account. Additional terms were included to correct for the effects of iterative triple excitations (CCSDT), noniterative quadruple excitations (CCSDT(Q)), and scalar relativistic contributions (DKH2-CCSD(T)). The performance of this computational procedure was established through test calculations on selected small molecules. For s-triazine, accurate experimental ground-state rotational constants (B0) of the parent molecule and six D3h isotopologues from the literature were used to determine a semiexperimental re structure, which was found to be essentially identical with the best estimate from the current composite approach. The presently recommended equilibrium structural parameters of s-triazine are re(CH) = 108.17 pm, re(CN) = 133.19 pm, and θe(NCN) = 125.95°, with estimated uncertainties of ±0.10 pm and ±0.10°, respectively. The predicted equilibrium geometries for pyrazine and s-tetrazine are expected to be of the same accuracy. We recommend for pyrazine: re(CH) = 108.16 pm, re(CN) = 133.34 pm, re(CC) = 139.07 pm, θe(CNC) = 115.60°, and θe(HCC) = 120.75°; and for s-tetrazine: re(CH) = 107.95 pm, re(CN) = 133.39 pm, re(NN) = 132.01 pm, and θe(NCN) = 126.59°.

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Language(s): eng - English
 Dates: 2018-07-302018-08-282019-04-04
 Publication Status: Published in print
 Pages: 12
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acs.jpcc.8b07326
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Title: The Journal of Physical Chemistry C
  Abbreviation : J. Phys. Chem. C
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: - Volume / Issue: 123 (13) Sequence Number: - Start / End Page: 7940 - 7951 Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766