Vanadium-51 nuclear magnetic resonance is a method for the characterization of vanadium-containing compounds and materials. 51V comprises 99.75% of naturally occurring vanadium. 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, so that 51V has 38% receptivity vs 1H. Its resonance frequency is close to that of 13C.