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Barone, V.; Provasi, P.F.; Peralta, J.E.; Snyder, J.P.; Sauer, S.P.A.; Contreras, R.H. "Substituent effects on scalar 2J(19F,19F) and 3J(19F,19F) NMR couplings: A comparison of SOPPA and DFT methods" (2003) Journal of Physical Chemistry A. 107(23):4748-4754
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Abstract:

Substituent effects for 2J(F,F) couplings in aliphatic and olefinic CF2 moieties and 3J(F,F) couplings in fluorinated derivatives of ethylene were studied using both high level ab initio and DFT/B3LYP calculations. Where possible, J variations have been compared with experimental values. In general, the SOPPA (second-order polarization propagator approximation) methodology matches absolute experimental values reasonably well, whereas the DFT/B3LYP approach performs poorly in describing 2J(F,F) couplings. Fortunately, substituent effects for DFT J couplings are notably better reproduced. For a vinyl CF2 moiety, the accurate prediction of 2J(F,F) couplings is a challenging task even for high level ab initio methods such as SOPPA and SOPPA(CCSD) (second-order polarization propagator approximation with coupled cluster singles and doubles amplitudes). Aliphatic 2J(F,F) couplings are very sensitive to the electronegativity of substituents placed a to the CF2 group. The latter J perturbations are dominated largely by the noncontact PSO and SD Ramsey contributions, whereas the influence of the FC term is rather small. Substituent effects on 2J(F,F) and 3J(F,F) couplings in fluorinated derivatives of ethylene are also dominated by non-Fermi contributions. Because DFT/B3LYP strongly underestimates the FC contribution, but generally assesses the non-Fermi terms similar to SOPPA, the latter accounts for DFT's ability to predict substituent effects reasonably well.

Registro:

Documento: Artículo
Título:Substituent effects on scalar 2J(19F,19F) and 3J(19F,19F) NMR couplings: A comparison of SOPPA and DFT methods
Autor:Barone, V.; Provasi, P.F.; Peralta, J.E.; Snyder, J.P.; Sauer, S.P.A.; Contreras, R.H.
Filiación:Department of Physics and CONICET, University of Buenos Aires, FCEyN, Argentina
Department of Physics, North-Eastern University, FACENA, Argentina
Department of Chemistry, Rice University, Houston, TX 77005, United States
Department of Chemistry, Emory University, Atlanta, GA 30322, United States
Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
Palabras clave:Moieties; Derivatives; Ethylene; Fluorine compounds; Nuclear magnetic resonance spectroscopy; Perturbation techniques; Probability density function; Hydrogen bonds
Año:2003
Volumen:107
Número:23
Página de inicio:4748
Página de fin:4754
DOI: http://dx.doi.org/10.1021/jp0300851
Título revista:Journal of Physical Chemistry A
Título revista abreviado:J Phys Chem A
ISSN:10895639
CODEN:JPCAF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10895639_v107_n23_p4748_Barone

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Citas:

---------- APA ----------
Barone, V., Provasi, P.F., Peralta, J.E., Snyder, J.P., Sauer, S.P.A. & Contreras, R.H. (2003) . Substituent effects on scalar 2J(19F,19F) and 3J(19F,19F) NMR couplings: A comparison of SOPPA and DFT methods. Journal of Physical Chemistry A, 107(23), 4748-4754.
http://dx.doi.org/10.1021/jp0300851
---------- CHICAGO ----------
Barone, V., Provasi, P.F., Peralta, J.E., Snyder, J.P., Sauer, S.P.A., Contreras, R.H. "Substituent effects on scalar 2J(19F,19F) and 3J(19F,19F) NMR couplings: A comparison of SOPPA and DFT methods" . Journal of Physical Chemistry A 107, no. 23 (2003) : 4748-4754.
http://dx.doi.org/10.1021/jp0300851
---------- MLA ----------
Barone, V., Provasi, P.F., Peralta, J.E., Snyder, J.P., Sauer, S.P.A., Contreras, R.H. "Substituent effects on scalar 2J(19F,19F) and 3J(19F,19F) NMR couplings: A comparison of SOPPA and DFT methods" . Journal of Physical Chemistry A, vol. 107, no. 23, 2003, pp. 4748-4754.
http://dx.doi.org/10.1021/jp0300851
---------- VANCOUVER ----------
Barone, V., Provasi, P.F., Peralta, J.E., Snyder, J.P., Sauer, S.P.A., Contreras, R.H. Substituent effects on scalar 2J(19F,19F) and 3J(19F,19F) NMR couplings: A comparison of SOPPA and DFT methods. J Phys Chem A. 2003;107(23):4748-4754.
http://dx.doi.org/10.1021/jp0300851