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The observation of a double-quantum filtered signal of quadrupolar nuclei (e.g. 23 Na) in solution has been traditionally interpreted as a sign for anisotropic reorientational motion. Ling and Jerschow (2007) [23] have found that a 23 Na double-quantum signal is observed also in solutions of TmDOTPNa 5 . Interference effects between the quadrupolar and the paramagnetic interactions...
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