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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Unexpected Geometrical Effects on Paramagnetic Spin-Orbit and Spin-Dipolar (2)J(FF) Couplings

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Ducati, Lucas C. [1] ; Contreras, Ruben H. [2, 3] ; Tormena, Claudio F. [1]
Total Authors: 3
[1] Univ Estadual Campinas, Inst Chem, BR-13084971 Campinas, SP - Brazil
[2] Univ Buenos Aires, Dept Phys, FCEyN, Buenos Aires, DF - Argentina
[3] IFIBA CONICET, Buenos Aires, DF - Argentina
Total Affiliations: 3
Document type: Journal article
Source: Journal of Physical Chemistry A; v. 116, n. 20, p. 4930-4933, MAY 24 2012.
Web of Science Citations: 9

The second-rank tensor character of the paramagnetic spin orbit and spin dipolar contributions to nuclear spin spin coupling constants is usually ignored when NMR measurements are carried out in the isotropic phase. However, in this study it is shown that isotropic (2)J(FF) couplings strongly depend on the relative orientation of the C F bonds containing the coupling nuclei and the eigenvectors of such tensors. Predictions about such effect are obtained using a qualitative approach based on the polarization propagator formalism at the RPA, and results are corroborated performing high-level ab initio spin spin coupling calculations at the SOPPA(CCSD)/EPR-III//MP2/EPR-III level in a model system. It is highlighted that no calculations at the RPA level were carried out in this work. The quite promising results reported in this paper suggest that similar properties are expected to hold for the second-rank nuclear magnetic shielding tensor. (AU)

FAPESP's process: 10/10993-9 - Transmission mechanism through space scalar coupling constants in NMR
Grantee:Claudio Francisco Tormena
Support type: Regular Research Grants