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Rotational dynamics of benzene rings in the flexible MIL-53 and rigid MIL-47 frameworks was investigated by 2H NMR spectroscopy. In both cases, 180° flips are observed, and the flipping rate is higher in MIL-53. To simulate experimental spectra (left), consideration of the quadrupolar interaction alone is not sufficient (middle); the paramagnetic effect must also be taken into account (right).
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Kolokolov et al. (2010) studied this question.
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