Vanadium-51 nuclear magnetic resonance (⁵¹V

NMR spectroscopy Nuclear magnetic resonance spectroscopy, most commonly known as NMR spectroscopy or magnetic resonance spectroscopy (MRS), is a spectroscopic technique to observe local magnetic fields around atomic nuclei. The sample is placed in a magnetic fiel ...

) is a method for the characterization of vanadium-containing compounds and materials. ⁵¹V comprises 99.75% of naturally occurring element. The nucleus is quadrupolar with I = 7/2, which is not favorable for NMR spectroscopy. The quadrupole moment is small, thus the linewidths are small. The

magnetogyric ratio In physics, the gyromagnetic ratio (also sometimes known as the magnetogyric ratio in other disciplines) of a particle or system is the ratio of its magnetic moment to its angular momentum, and it is often denoted by the symbol Gamma, , gamma. Its ...

is relatively high (+7.0492 rad T⁻¹s⁻¹), such that ⁵¹V has 38% receptivity vs ¹H. Its resonance frequency is close to that of ¹³C (gyromagnetic ratio = 6.728284 rad T⁻¹s⁻¹). The chemical shift dispersion is great as illustrated by this series: 0 for VOCl₃ (chemical shift standard), −309 for VOCl₂(O-i-Pr), −506 VOCl(O-i-Pr)₂, and −629 VO(O-i-Pr)₃. For vanadates, the parent

orthovanadate In chemistry, a vanadate is an anionic coordination complex of vanadium. Often vanadate refers to oxoanions of vanadium, most of which exist in its highest oxidation state of +5. The complexes and are referred to as hexacyanovanadate(III) and no ...

and its conjugate acid absorb at −541 ( O₄sup>3-) and 534 ( VO₄sup>2-). For

decavanadate Sodium decavanadate describes any member of the family of inorganic compounds with the formula Na6 10O28H2O)n. These are sodium salts of the orange-colored decavanadate anion 10O28sup>6−. Numerous other decavanadate salts have been isolated and ...

, three shifts are observed in accord with the number of nonequivalent sites: −422, −502, −519.

References

{{NMR by isotope Nuclear magnetic resonance Vanadium