Analysis of the phosphorus lone-pair orientational effect on 31P13C couplings in 7-(phosphamethyl)norbornene
An IPPP-INDO analysis of PC couplings is carried out in 7-(phosphamethyl) norbornene for the anti and syn conformations. A strong orientational effect of the P lone pair is expected to be responsible for the differences in the coupling values between conformations. Total couplings are decomposed int...
Guardado en:
Autores principales: | , , , |
---|---|
Publicado: |
1988
|
Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01661280_v164_n1-2_p1_Aucar http://hdl.handle.net/20.500.12110/paper_01661280_v164_n1-2_p1_Aucar |
Aporte de: |
id |
paper:paper_01661280_v164_n1-2_p1_Aucar |
---|---|
record_format |
dspace |
spelling |
paper:paper_01661280_v164_n1-2_p1_Aucar2023-06-08T15:15:08Z Analysis of the phosphorus lone-pair orientational effect on 31P13C couplings in 7-(phosphamethyl)norbornene Aucar, Gustavo A. Giribet, Claudia Gloria Diz, Agustín Carlos Contreras, Rubén Horacio An IPPP-INDO analysis of PC couplings is carried out in 7-(phosphamethyl) norbornene for the anti and syn conformations. A strong orientational effect of the P lone pair is expected to be responsible for the differences in the coupling values between conformations. Total couplings are decomposed into through-space and through-bond components. Further analysis of the through-space Fermi contact term is carried out by resolving it into contributions given by different "through-space coupling pathways", each pathway being defined by excitations which are amenable to direct analysis using the inner-projected polarization propagator technique. The experimental trends of PC couplings in both conformations are closely reproduced. The differences between both conformations are found to be ruled by: (i) the orientation of the P lone pair, which is shown to be an efficient means of transmitting the spin information; (ii) the transmission through the CH rear lobe; and (iii) the orientational effect of the PC antibonding molecular orbital. From (iii) the important role played by vacant molecular orbitals is also brought to attention. © 1988. Fil:Aucar, G.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Giribet, C.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Diz, A.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Contreras, R.H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1988 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01661280_v164_n1-2_p1_Aucar http://hdl.handle.net/20.500.12110/paper_01661280_v164_n1-2_p1_Aucar |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
description |
An IPPP-INDO analysis of PC couplings is carried out in 7-(phosphamethyl) norbornene for the anti and syn conformations. A strong orientational effect of the P lone pair is expected to be responsible for the differences in the coupling values between conformations. Total couplings are decomposed into through-space and through-bond components. Further analysis of the through-space Fermi contact term is carried out by resolving it into contributions given by different "through-space coupling pathways", each pathway being defined by excitations which are amenable to direct analysis using the inner-projected polarization propagator technique. The experimental trends of PC couplings in both conformations are closely reproduced. The differences between both conformations are found to be ruled by: (i) the orientation of the P lone pair, which is shown to be an efficient means of transmitting the spin information; (ii) the transmission through the CH rear lobe; and (iii) the orientational effect of the PC antibonding molecular orbital. From (iii) the important role played by vacant molecular orbitals is also brought to attention. © 1988. |
author |
Aucar, Gustavo A. Giribet, Claudia Gloria Diz, Agustín Carlos Contreras, Rubén Horacio |
spellingShingle |
Aucar, Gustavo A. Giribet, Claudia Gloria Diz, Agustín Carlos Contreras, Rubén Horacio Analysis of the phosphorus lone-pair orientational effect on 31P13C couplings in 7-(phosphamethyl)norbornene |
author_facet |
Aucar, Gustavo A. Giribet, Claudia Gloria Diz, Agustín Carlos Contreras, Rubén Horacio |
author_sort |
Aucar, Gustavo A. |
title |
Analysis of the phosphorus lone-pair orientational effect on 31P13C couplings in 7-(phosphamethyl)norbornene |
title_short |
Analysis of the phosphorus lone-pair orientational effect on 31P13C couplings in 7-(phosphamethyl)norbornene |
title_full |
Analysis of the phosphorus lone-pair orientational effect on 31P13C couplings in 7-(phosphamethyl)norbornene |
title_fullStr |
Analysis of the phosphorus lone-pair orientational effect on 31P13C couplings in 7-(phosphamethyl)norbornene |
title_full_unstemmed |
Analysis of the phosphorus lone-pair orientational effect on 31P13C couplings in 7-(phosphamethyl)norbornene |
title_sort |
analysis of the phosphorus lone-pair orientational effect on 31p13c couplings in 7-(phosphamethyl)norbornene |
publishDate |
1988 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01661280_v164_n1-2_p1_Aucar http://hdl.handle.net/20.500.12110/paper_01661280_v164_n1-2_p1_Aucar |
work_keys_str_mv |
AT aucargustavoa analysisofthephosphoruslonepairorientationaleffecton31p13ccouplingsin7phosphamethylnorbornene AT giribetclaudiagloria analysisofthephosphoruslonepairorientationaleffecton31p13ccouplingsin7phosphamethylnorbornene AT dizagustincarlos analysisofthephosphoruslonepairorientationaleffecton31p13ccouplingsin7phosphamethylnorbornene AT contrerasrubenhoracio analysisofthephosphoruslonepairorientationaleffecton31p13ccouplingsin7phosphamethylnorbornene |
_version_ |
1768541793031290880 |