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14 N magic-angle spinning (MAS) nuclear magnetic resonance (NMR) spectra of diamagnetic LaTiO 2 N perovskite oxynitride and its paramagnetic counterpart CeTiO 2 N are presented. The latter, to the best of our knowledge, constitutes the first high-resolution  14 N MAS NMR spectrum collected from a paramagnetic solid material. The unpaired 4 f -electrons in CeTiO 2 N do not induce a paramagnetic  14 N NMR shift. This is remarkable given the direct Ce−N contacts in the structure for which  ab initio  calculations predict substantial Ce→ 14 N contact shift interaction. The same effect is revealed with  14 N MAS NMR for SrWO 2 N (unpaired 5 d -electrons).

CeTiO 2 N oxynitride perovskite: paramagnetic 14 N MAS NMR without paramagnetic shifts