Vanadium-51 nuclear magnetic resonance

<p>Vanadium-51 nuclear magnetic resonance (51V <a href="/facts/Nuclear_magnetic_resonance_spectroscopy/SFKgdthI">NMR spectroscopy</a>) is a method for the characterization of <a href="/facts/Vanadium/UvKkKTSm">vanadium</a>-containing <a href="/facts/Chemical_compound/37FXqqtv">compounds</a> 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 <a href="/facts/Magnetogyric_ratio/Afg6mY6M">magnetogyric ratio</a> 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).
</p><p>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 <a href="/facts/Orthovanadate/DmQrWVEh">orthovanadate</a> and its conjugate acid absorb at −541 ([VO4]3-) and 534 ([HVO4]2-).  For  <a href="/facts/Decavanadate/PcMh2l7c">decavanadate</a>, three shifts are observed in accord with the number of nonequivalent sites: −422, −502, −519.
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Vanadium-51 nuclear magnetic resonance open-in-new

Vanadium-51 nuclear magnetic resonance