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Pseudocontact shifts and paramagnetic susceptibility in semiempirical and quantum chemistry theories.

08:00 EDT 14th April 2019 | BioPortfolio

Summary of "Pseudocontact shifts and paramagnetic susceptibility in semiempirical and quantum chemistry theories."

Pseudocontact shifts are traditionally described as a function of the anisotropy of the paramagnetic susceptibility tensor, according to the semiempirical theory mainly developed by Kurland and McGarvey [J. Magn. Reson. 2, 286-301 (1970)]. The paramagnetic susceptibility tensor is required to be symmetric. Applying point-dipole approximation to the quantum chemistry theory of hyperfine shift, pseudocontact shifts are found to scale with a non-symmetric tensor that differs by a factor g/g from the paramagnetic susceptibility tensor derived within the semiempirical framework. We analyze the foundations of the Kurland-McGarvey pseudocontact shift expression and recall that it is inherently based on the Russell-Saunders (LS) coupling approximation for the spin-orbit coupling. We show that the difference between the semiempirical and quantum chemistry pseudocontact shift expressions arises directly from the different treatment of the orbital contribution to the hyperfine coupling.

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This article was published in the following journal.

Name: The Journal of chemical physics
ISSN: 1089-7690
Pages: 144101

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