Abstract
Paramagnetic NMR spectroscopy of EMFs with paramagnetic metal ions can deliver information on the structural and magnetic properties of EMFs. For a series of Ce-EMFs, analysis of the temperature dependence of chemical shifts in NMR spectra proved that the main contribution to the paramagnetic shifts is the dipolar “pseudocontact” term. As this term includes geometric parameters of the molecule, position and dynamics of endohedral metal atoms can be deduced from variable-temperature NMR spectra. For lanthanide-based nitride clusterfullerenes, pNMR provide information on the sign and size of the magnetic anisotropy of lanthanide ions. The influence of the cluster geometry on the paramagnetic chemical shifts is then discussed for HoM2N@C80 (M = Sc, Y, Lu) nitride clusterfullerenes.
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