Magnetic equivalence between nuclei of spin greater than 1/2 in presence of relaxation.
Both formal reasoning and numerical calculations of spectral lineshape functions confirm that magnetic equivalence between nuclei of spin greater than (1/2) is generally broken in presence of relaxation. This results in a dependence of the lineshape functions on the values of J-couplings between the nuclei that would be equivalent in absence of relaxation. Effects of this sort may be of practical importance for systems AnX, where the A nuclei are relaxed by quadrupolar interactions which are highly cross-correlated at different A sites.
Szymański
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Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44, Warsaw, 01-224, Poland.
D009682:Magnetic Resonance Spectroscopy