NMRlab
  • Login & order NMR service now
  • NMR service
    Login & order NMR service now NMR service NMR chromatography service Why use our superior service Contact us The NMR team How to submit samples Use the instruments yourself Terms & conditions
  • (V) Vanadium NMR
    (V) Vanadium NMR 50Vanadium NMR Properties of 50V 51Vanadium NMR Properties of 51V Safety note
  • NMR
    Go to home page What is NMR Techniques Apps Guides Contact us
  • עברית
  • HU NMR lab
  • Login & order NMR service now
  • NMR service
    Login & order NMR service now NMR service NMR chromatography service Why use our superior service Contact us The NMR team How to submit samples Use the instruments yourself Terms & conditions
  • (V) Vanadium NMR
  • 50Vanadium NMR
  • Properties of 50V
  • 51Vanadium NMR
  • Properties of 51V
  • Safety note
  • What is NMR
    What is NMR Uses of NMR Basis of NMR Chemical shift Spin-spin coupling
  • Techniques
    Techniques 1H NMR 2D NMR Relaxation Multinuclear Semi-solids Solid state
  • Apps
    Apps Solvent shifts NMR thermometer Reference frequency
  • Guides
    Guides Measuring a 1H spectrum on the old 500 Measuring a 1H spectrum Measuring other nuclei Measuring 2D NMR Measuring diffusion Measuring relaxation Measuring solid & semi-solid
  • Contact us
  • Terms & conditions
  • עברית

(V) Vanadium NMR

Use our NMR service that provides V NMR and many other NMR techniques.

Vanadium (V) has two NMR active nuclei, 50V and 51V, with a very wide chemical shift range (fig. 1). Both nuclei are quadrupolar and therefore yield relatively broad signals in small molecules and signals, too broad to be observed with a high-resolution NMR spectrometer, in large molecules. 51V is the nucleus of choice because it is by far the more sensitive and yields much narrower lines although this is only relative and 51V signals are quite broad (fig. 2). Vanadium NMR is used in the study of small vanadium complexes and vanadium binding in solution.

Fig. 1. Chemical shift ranges for vanadium NMR

Chemical shifts of vanadium

Fig. 2. Comparison of 50V and 51V for VOCl3 (neat). 51V yields much greater sensitivity and much narrower signals.

Comparison of 50V and 51V spectra

Each type of vanadium compound has its characteristic chemical shift range (fig. 1). The NMR of Vanadium can be observed in its (-I), (I), and (V) oxidation states however, V(0), (II) and (IV) are paramagnetic and cannot be observed in high resolution NMR.

50Vanadium NMR

50V (fig. 3) is much less sensitive and yields much broader signals than 51V so is not the nucleus of choice.

Fig. 3. 50V-NMR spectrum of neat VOCl3

50V spectrum

Properties of 50V

(Click here for explanation)

PropertyValue
Spin6
Natural abundance0.250%
Chemical shift range1900 ppm, from -1900 to 0
Frequency ratio (Ξ)9.970309%
Reference compoundVOCl3 (90%) in C6D6*
Linewidth of reference68 Hz
T1 of reference0.005 s
Receptivity rel. to 1H at natural abundance1.39 × 10-4
Receptivity rel. to 1H when enriched0.0556
Receptivity rel. to 13C at natural abundance0.818
Receptivity rel. to 13C when enriched327
Linewidth parameter17 fm4

*Note that pure VOCl3 resonates at 2 ppm in the 50V-NMR spectrum.

51Vanadium NMR

51V preferred as an NMR nucleus over 50V because it is much more sensitive and yields shaper signals. 51V yields somewhat broad lines in small symmetric molecules (fig. 4) but its signals become wider with increasing size of the complex and too broad to observe with a high-resolution NMR spectrometer for medium sized complexes. 51V NMR is used in the study of small vanadium complexes and vanadium binding in solution.

Fig. 4. 51V-NMR spectrum of neat VOCl3

51V spectrum

Properties of 51V

(Click here for explanation)

PropertyValue
Spin7/2
Natural abundance99.750%
Chemical shift range1900 ppm, from -1900 to 0
Frequency ratio (Ξ)26.302948%
Reference compoundVOCl3 (90%) in C6D6
Linewidth of reference21 Hz
T1 of reference0.0203 s
Receptivity rel. to 1H at natural abundance0.383
Receptivity rel. to 1H when enriched0.384
Receptivity rel. to 13C at natural abundance2250
Receptivity rel. to 13C when enriched2256
Linewidth parameter3.7 fm4

*Note that pure VOCl3 resonates at 2 ppm in the 51V-NMR spectrum.

Safety note

Some of the materials mentioned here are very dangerous. Ask a qualified chemist for advice before handling them. Qualified chemists should check the relevant safety literature before handling or giving advice about unfamiliar substances. NMR solvents are toxic and most are flammable. Specifically, VOCl3 is toxic and reacts with moist air to give toxic fumes (HCl): wear gloves, work under nitrogen in a hood. Vanadium salts are toxic: wear gloves. 50V is very slightly radioactive but is not considered a radiation hazard, at least at natural abundance.