Hyperconjugation: the electronic mechanism that may underlie the Karplus curve of vicinal NMR indirect spin couplings
- Autores
- Provasi, Patricio Federico; Gómez, Carlos Anselmo; Aucar, Gustavo Adolfo
- Año de publicación
- 2004
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The electronic origin of the Karplus-type behavior of vicinal NMR J couplings for H3X−C2H4−XH3, X = C, Sn model compound is analyzed within the framework of the polarization propagator formalism. It is shown that its whole pattern can be understood by generalizing previous hyperconjugative mechanisms, in such a way that the hyperconjugative delocalization effect from an excitation σ → σ* should be replaced by two simultaneous excitations according to a second-order electronic property. All and the main coupling pathway which involve, at the random phase level of approach, RPA, the two pairs of localized MOs closest to the coupled nuclei follows a Karplus-type dependence with dihedral X−C−C−X angle, θ. The specific two-electron integrals which include correlation at RPA level of approach are the main factors which define the total behavior of J. The Karplus-type dependence is also found at HF level for individual coupling pathways though that is not observed for the total J; the so-called nonlocal “perturbators” together with the inverse of the differences of energies define, at this level of approach, the functional dependence with θ.
Fil: Provasi, Patricio Federico. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas y Naturales y Agrimensura. Departamento de Física; Argentina
Fil: Gómez, Carlos Anselmo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas y Naturales y Agrimensura. Departamento de Física; Argentina
Fil: Aucar, Gustavo Adolfo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas y Naturales y Agrimensura. Departamento de Física; Argentina - Materia
-
Nmr
Spin-Spin Coupling Constant
Karplus Curve
Hyperconjugation - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/22023
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Hyperconjugation: the electronic mechanism that may underlie the Karplus curve of vicinal NMR indirect spin couplingsProvasi, Patricio FedericoGómez, Carlos AnselmoAucar, Gustavo AdolfoNmrSpin-Spin Coupling ConstantKarplus CurveHyperconjugationhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1The electronic origin of the Karplus-type behavior of vicinal NMR J couplings for H3X−C2H4−XH3, X = C, Sn model compound is analyzed within the framework of the polarization propagator formalism. It is shown that its whole pattern can be understood by generalizing previous hyperconjugative mechanisms, in such a way that the hyperconjugative delocalization effect from an excitation σ → σ* should be replaced by two simultaneous excitations according to a second-order electronic property. All and the main coupling pathway which involve, at the random phase level of approach, RPA, the two pairs of localized MOs closest to the coupled nuclei follows a Karplus-type dependence with dihedral X−C−C−X angle, θ. The specific two-electron integrals which include correlation at RPA level of approach are the main factors which define the total behavior of J. The Karplus-type dependence is also found at HF level for individual coupling pathways though that is not observed for the total J; the so-called nonlocal “perturbators” together with the inverse of the differences of energies define, at this level of approach, the functional dependence with θ.Fil: Provasi, Patricio Federico. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas y Naturales y Agrimensura. Departamento de Física; ArgentinaFil: Gómez, Carlos Anselmo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas y Naturales y Agrimensura. Departamento de Física; ArgentinaFil: Aucar, Gustavo Adolfo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas y Naturales y Agrimensura. Departamento de Física; ArgentinaAmerican Chemical Society2004-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/22023Provasi, Patricio Federico; Gómez, Carlos Anselmo; Aucar, Gustavo Adolfo; Hyperconjugation: the electronic mechanism that may underlie the Karplus curve of vicinal NMR indirect spin couplings; American Chemical Society; Journal of Physical Chemistry A; 108; 29; 6-2004; 6231-62381089-5639CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1021/jp0369948info:eu-repo/semantics/altIdentifier/url/http://pubs.acs.org/doi/10.1021/jp0369948info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:06:40Zoai:ri.conicet.gov.ar:11336/22023instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:06:40.999CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Hyperconjugation: the electronic mechanism that may underlie the Karplus curve of vicinal NMR indirect spin couplings |
title |
Hyperconjugation: the electronic mechanism that may underlie the Karplus curve of vicinal NMR indirect spin couplings |
spellingShingle |
Hyperconjugation: the electronic mechanism that may underlie the Karplus curve of vicinal NMR indirect spin couplings Provasi, Patricio Federico Nmr Spin-Spin Coupling Constant Karplus Curve Hyperconjugation |
title_short |
Hyperconjugation: the electronic mechanism that may underlie the Karplus curve of vicinal NMR indirect spin couplings |
title_full |
Hyperconjugation: the electronic mechanism that may underlie the Karplus curve of vicinal NMR indirect spin couplings |
title_fullStr |
Hyperconjugation: the electronic mechanism that may underlie the Karplus curve of vicinal NMR indirect spin couplings |
title_full_unstemmed |
Hyperconjugation: the electronic mechanism that may underlie the Karplus curve of vicinal NMR indirect spin couplings |
title_sort |
Hyperconjugation: the electronic mechanism that may underlie the Karplus curve of vicinal NMR indirect spin couplings |
dc.creator.none.fl_str_mv |
Provasi, Patricio Federico Gómez, Carlos Anselmo Aucar, Gustavo Adolfo |
author |
Provasi, Patricio Federico |
author_facet |
Provasi, Patricio Federico Gómez, Carlos Anselmo Aucar, Gustavo Adolfo |
author_role |
author |
author2 |
Gómez, Carlos Anselmo Aucar, Gustavo Adolfo |
author2_role |
author author |
dc.subject.none.fl_str_mv |
Nmr Spin-Spin Coupling Constant Karplus Curve Hyperconjugation |
topic |
Nmr Spin-Spin Coupling Constant Karplus Curve Hyperconjugation |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
The electronic origin of the Karplus-type behavior of vicinal NMR J couplings for H3X−C2H4−XH3, X = C, Sn model compound is analyzed within the framework of the polarization propagator formalism. It is shown that its whole pattern can be understood by generalizing previous hyperconjugative mechanisms, in such a way that the hyperconjugative delocalization effect from an excitation σ → σ* should be replaced by two simultaneous excitations according to a second-order electronic property. All and the main coupling pathway which involve, at the random phase level of approach, RPA, the two pairs of localized MOs closest to the coupled nuclei follows a Karplus-type dependence with dihedral X−C−C−X angle, θ. The specific two-electron integrals which include correlation at RPA level of approach are the main factors which define the total behavior of J. The Karplus-type dependence is also found at HF level for individual coupling pathways though that is not observed for the total J; the so-called nonlocal “perturbators” together with the inverse of the differences of energies define, at this level of approach, the functional dependence with θ. Fil: Provasi, Patricio Federico. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas y Naturales y Agrimensura. Departamento de Física; Argentina Fil: Gómez, Carlos Anselmo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas y Naturales y Agrimensura. Departamento de Física; Argentina Fil: Aucar, Gustavo Adolfo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas y Naturales y Agrimensura. Departamento de Física; Argentina |
description |
The electronic origin of the Karplus-type behavior of vicinal NMR J couplings for H3X−C2H4−XH3, X = C, Sn model compound is analyzed within the framework of the polarization propagator formalism. It is shown that its whole pattern can be understood by generalizing previous hyperconjugative mechanisms, in such a way that the hyperconjugative delocalization effect from an excitation σ → σ* should be replaced by two simultaneous excitations according to a second-order electronic property. All and the main coupling pathway which involve, at the random phase level of approach, RPA, the two pairs of localized MOs closest to the coupled nuclei follows a Karplus-type dependence with dihedral X−C−C−X angle, θ. The specific two-electron integrals which include correlation at RPA level of approach are the main factors which define the total behavior of J. The Karplus-type dependence is also found at HF level for individual coupling pathways though that is not observed for the total J; the so-called nonlocal “perturbators” together with the inverse of the differences of energies define, at this level of approach, the functional dependence with θ. |
publishDate |
2004 |
dc.date.none.fl_str_mv |
2004-06 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/22023 Provasi, Patricio Federico; Gómez, Carlos Anselmo; Aucar, Gustavo Adolfo; Hyperconjugation: the electronic mechanism that may underlie the Karplus curve of vicinal NMR indirect spin couplings; American Chemical Society; Journal of Physical Chemistry A; 108; 29; 6-2004; 6231-6238 1089-5639 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/22023 |
identifier_str_mv |
Provasi, Patricio Federico; Gómez, Carlos Anselmo; Aucar, Gustavo Adolfo; Hyperconjugation: the electronic mechanism that may underlie the Karplus curve of vicinal NMR indirect spin couplings; American Chemical Society; Journal of Physical Chemistry A; 108; 29; 6-2004; 6231-6238 1089-5639 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.1021/jp0369948 info:eu-repo/semantics/altIdentifier/url/http://pubs.acs.org/doi/10.1021/jp0369948 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
American Chemical Society |
publisher.none.fl_str_mv |
American Chemical Society |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
reponame_str |
CONICET Digital (CONICET) |
collection |
CONICET Digital (CONICET) |
instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.name.fl_str_mv |
CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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1844613918311317504 |
score |
13.070432 |