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• W2040243764 endingPage "3698" @default.
• W2040243764 startingPage "3692" @default.
• W2040243764 abstract "Recent theory has predicted that rhombicity in the zero-field splitting (zfs) tensor of transition metal ions with integer spin S ≥ 1 exerts a strong influence on the NMR- paramagnetic relaxation enhancements (NMR-PRE) of resonances of nuclear spins in solution. ZFS rhombicity induces rapid oscillation in the z-component of the electron spin vector, which in the absence of rhombicity, is static with respect to precession or oscillation. Rapid oscillation of Sz acts to decouple the nuclear spin magnetic moment from the local field produced by the electron spin, and in this way profoundly depresses the NMR-PRE. The influence of zfs-rhombicity on the solvent 1H NMR-PRE produced by the complex ion trans-bis(2,4-pentanedione)diaquanickel(II) in dioxane solution has been studied by variable field (0.14−8.5 T) T1 and T2 measurements. It is shown that the functional form of the T1 field dispersion profile can be fit by the mathematical expressions of the Zeeman-limit Solomon−Bloembergen−Morgan theory, although the parameters of such a fit are physically meaningless. Spin dynamics simulation methods which account quantitatively for the effects of zfs interactions lead to a very different physical picture of the spin relaxation process, one in which zfs rhombicity is of central importance in determining the functional form of the field dispersion profile." @default.
• W2040243764 created "2016-06-24" @default.
• W2040243764 creator A5025163016 @default.
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• W2040243764 date "1997-05-01" @default.
• W2040243764 modified "2023-09-24" @default.
• W2040243764 title "Role of Zero-Field Splitting Interactions in the NMR Paramagnetic Relaxation Enhancements Produced by Ni(II)(acac)₂(H₂O)₂" @default.
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• W2040243764 doi "https://doi.org/10.1021/jp970254f" @default.
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