Among the early transition metals of the B groups III–VII, there are four spin-1/2 nuclei (89Y, 169Tm, 171Yb, 183W), but 89Y and 183W are the only ones for which a substantial amount of high-resolution NMR data has been reported. The other early transition metal nuclei have nuclear spins > 1/2 (and, with the exception of Ce, there is at least one magnetic isotope for each metal). Relaxation for these nuclei is governed by the quadrupolar mechanism, causing comparatively broad resonance signals unless the nuclear quadrupole moment is small (51V) and/or the local symmetry is such that the field gradient is very small (O h , T d , some cases of C3v ). A nuclear quadrupole has often been considered to seriously hamper NMR detection. In fact, there are a few nuclei with nuclear quadrupole moments so large as to cause severe problems (177Hf, 179Hf, 181Ta, 185Re, 187Re, 235U), but in general, the high relative receptivity for most of the nuclei, the large shielding sensitivity, and the fact that information on the electronic surroundings of the metal can be obtained by direct probing of the coordination center readily overcome disadvantages encountered with line broadening. Furthermore, the linewidth provides an additional parameter for the investigation of electronic interactions.

Early Transition Metals, Lanthanides and Actinides

Influence of Er3+ ions on 53Cr NMR in domain walls of LuCrO3

Cr53 nuclear magnetic resonance in domain walls of yttrium orthochromite

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Cr53 nuclear magnetic resonance in domain walls of yttrium orthochromite

Influence of Er3+ ions on 53Cr NMR in domain walls of LuCrO3