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• W2056770119 abstract "Spin relaxation is usually investigated by disturbing the spin system and then observing it as it decays back to equilibrium. This is the familiar inversion-recovery experiment (1, 2). With a coupled spin system, the naive expectation is that all the members of a multiplet will relax at the same rate, since they all “belong” to the same nucleus. This is certainly not true in general, since systems with equivalent spins can show differential relaxation if there is correlation among the motions of the spins in the molecule (3-5). However, except in pathological cases (6-9), this differential rel,axation in a multiplet is an “inner vs outer” difference, rather than a “left vs right” difference. This is based on some fundamental symmetries in the spin relaxation (IO). Strong coupling can also disturb the simple picture of spin relaxation (II-13), and the possible flipangle dependence of the spectra may play a part ( 14-16). When the strong left-right asymmetry in the relaxation of N,N’-bis( 2-ethylhexyl)-3,4,9, lo-perylenetetracarboxylic dimide was observed (see Fig. 1)) there were several possible explanations. This paper presents the mechanism for this asymmetry, shows that it is a general phenomenon in strongly coupled systems, and confirms and illustrates some theoretical analyses in the definitive work on spin relaxation in strongly coupled systems by Vold and Vold ( I1 ). Although these spectra are unusual, it is not the first time that this effect has been reported in the literature (I 7). Some of the candidates for an explanation were as follows. First, although the spin system is apparently an AB system, it is, strictly speaking, better described as [ AB], or even [ ABId, and there may be some correlation effects in the relaxation of this spin system. Furthermore, in a strongly coupled system, not only do the x-y magnetizations alter, but the character of the z magnetizations also changes with the strength of the coupling (14, 18). Another possibility is that there may really be asymmetric cross terms in the relaxation. Finally, both strong coupling and large flip angles are known to mix transitions together (1%Z6), so the" @default.
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• W2056770119 date "1992-02-01" @default.
• W2056770119 modified "2023-09-23" @default.
• W2056770119 title "Apparent asymmetry in the relaxation of a strongly coupled spin system" @default.
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• W2056770119 doi "https://doi.org/10.1016/0022-2364(92)90348-b" @default.
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