Vanadium-51 nuclear magnetic resonance (51V NMR spectroscopy) is a method for the characterization of vanadium-containing compounds and materials.
The nucleus is quadrupolar with I = 7/2, which is not favorable for NMR spectroscopy, although its quadrupole moment and thus the linewidths are unusually small, while its magnetogyric ratio is relatively high (+7.0492 rad T−1s−1), so that 51V has 38% receptivity vs 1H.
Its resonance frequency is close to that of 13C (gyromagnetic ratio = 6.728284 rad T−1s−1).
For vanadates, the parent orthovanadate and its conjugate acid absorb at −541 ([VO4]3-) and 534 ([HVO4]2-).
For decavanadate, three shifts are observed in accord with the number of nonequivalent sites: −422, −502, −519.