MUNZAROVÁ, Markéta, Pavel KUBÁČEK and Martin KAUPP. Mechanisms of EPR Hyperfine Coupling in Transition Metal Complexes. The Journal of the American Chemical Society. Washington, D.C.: American Chemical Society, 2000, vol. 122, No 48, p. 11900-11913. ISSN 0002-7863. |
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@article{344294, author = {Munzarová, Markéta and Kubáček, Pavel and Kaupp, Martin}, article_location = {Washington, D.C.}, article_number = {48}, keywords = {Density functional theory; EPR parameters; hyperfine coupling constants; transition metal complexes; spin polarization}, language = {eng}, issn = {0002-7863}, journal = {The Journal of the American Chemical Society}, title = {Mechanisms of EPR Hyperfine Coupling in Transition Metal Complexes}, volume = {122}, year = {2000} }
TY - JOUR ID - 344294 AU - Munzarová, Markéta - Kubáček, Pavel - Kaupp, Martin PY - 2000 TI - Mechanisms of EPR Hyperfine Coupling in Transition Metal Complexes JF - The Journal of the American Chemical Society VL - 122 IS - 48 SP - 11900 EP - 11900 PB - American Chemical Society SN - 00027863 KW - Density functional theory KW - EPR parameters KW - hyperfine coupling constants KW - transition metal complexes KW - spin polarization N2 - A detailed quantum chemical analysis of the underlying principles of hyperfine coupling in 3d transition metal complexes has been carried out. The explicit evaluation of one- and two-electron integrals for some atomic systems has been used to understand the spin polarization of the core shells. While spin polarization enhances the exchange interaction of the 2s and 2p shells with the singly occupied orbitals, the opposite spin polarization of the 3s and 3p shells arises from the required orthogonality to the 2s and 2p shells, respectively. Core-shell spin polarization in molecules is found to be proportional to the spin population in the valence 3d orbitals but to depend little on other details of bonding. In contrast, the spin polarization of the valence shell depends crucially on the overlap between the singly occupied and certain doubly occupied valence orbitals. Large overlap leads to pronounced spin polarization of these orbitals and, among other things, likely to spin contamination when using UHF wave functions or hybrid density functionals. The role of core- and valence-shell spin polarization for dipolar hyperfine couplings in transition metal complexes is discussed. It is demonstrated that great care should be exercised in deriving spin populations or even orbital compositions from dipolar couplings alone. ER -
MUNZAROVÁ, Markéta, Pavel KUBÁČEK and Martin KAUPP. Mechanisms of EPR Hyperfine Coupling in Transition Metal Complexes. \textit{The Journal of the American Chemical Society}. Washington, D.C.: American Chemical Society, 2000, vol.~122, No~48, p.~11900-11913. ISSN~0002-7863.
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