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dc.contributor.author
Provasi, Patricio Federico  
dc.contributor.author
Aucar, Gustavo Adolfo  
dc.contributor.author
Sauer, Stephan P. A.  
dc.date.available
2017-09-20T15:04:56Z  
dc.date.issued
2000-03  
dc.identifier.citation
Provasi, Patricio Federico; Aucar, Gustavo Adolfo; Sauer, Stephan P. A.; The use of locally dense basis sets in the calculation of indirect nuclear spin–spin coupling constants: The vicinal coupling constants in H3C–CH2X (X=H, F, Cl, Br, I); American Institute of Physics; Journal of Chemical Physics; 112; 14; 3-2000; 6201-6208  
dc.identifier.issn
0021-9606  
dc.identifier.uri
http://hdl.handle.net/11336/24665  
dc.description.abstract
We have calculated the vicinal indirect nuclear spin-spin coupling constants 3J1H1H3J1H1H  in the series of molecules H3C–CH2XH3C–CH2X with X=H, F, Cl, Br, and I at the self-consistent field level and using the second order polarization propagator approximation (SOPPA). We have studied the effect of electron correlation and of the substituents (X=F, Cl, Br, and I) on all four contributions to the coupling constants. But in particular we have investigated the possibility of using locally dense basis sets, i.e., we have carried out calculations with basis sets, where the basis functions on the hydrogen atoms were optimized for the calculation of spin–spin coupling constants whereas on the other atoms smaller, contracted sets of basis functions were used. This changes the results for the couplings by ∼0.3 Hz or 3%. However, the change is almost entirely due to the orbital paramagnetic term and is independent of electron correlation, which enables one to estimate the SOPPA results in the full basis sets. Furthermore we find that the Fermi contact term is the dominant contribution to the vicinal coupling constants, because it is about an order of magnitude larger than the other contributions and because the two orbital angular moment terms almost cancel each other completely. Also the changes in the calculated couplings due to electron correlation are solely due to the Fermi contact term. However, the shifts in the coupling constants caused by the different substituents arise in equal amounts from the Fermi contact and the orbital diamagnetic term, whereas the changes in the orbital paramagnetic term are smaller and are in the opposite direction. In comparison with the experimental data we find very good agreement for C2H6C2H6 and C2H5F.C2H5F. However, the agreement becomes less good with increasing nuclear charge of the substituent X.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
American Institute of Physics  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights
Atribución-NoComercial-CompartirIgual 2.5 Argentina (CC BY-NC-SA 2.5 AR)  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Basis Sets  
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Nmr Parameters  
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Spin-Spin Coupling Constant  
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Substituent Effect  
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Electron Correlation Calculations  
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Paramagnetism  
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Diamagnetism  
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Polarization  
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Otras Ciencias Físicas  
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Ciencias Físicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
The use of locally dense basis sets in the calculation of indirect nuclear spin–spin coupling constants: The vicinal coupling constants in H3C–CH2X (X=H, F, Cl, Br, I)  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2017-08-04T15:41:04Z  
dc.identifier.eissn
1089-7690  
dc.journal.volume
112  
dc.journal.number
14  
dc.journal.pagination
6201-6208  
dc.journal.pais
Estados Unidos  
dc.journal.ciudad
Nueva York  
dc.description.fil
Fil: Provasi, Patricio Federico. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas Naturales y Agrimensura; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina  
dc.description.fil
Fil: Aucar, Gustavo Adolfo. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas Naturales y Agrimensura; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina  
dc.description.fil
Fil: Sauer, Stephan P. A.. Universidad de Copenhagen; Dinamarca  
dc.journal.title
Journal of Chemical Physics  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://aip.scitation.org/doi/abs/10.1063/1.481219  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1063/1.481219