(¹⁸³W) Tungsten NMR

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Tungsten (W) has one very low sensitivity NMR active nucleus, ¹⁸³W (fig. 1). It is a spin ½ nucleus and yields sharp signals over a very wide chemical shift range. ¹⁸³Tungsten NMR is mostly used for studying tungsten complexes, especially polyoxide clusters.

Fig. 1. ¹⁸³W-NMR spectrum of Na₂WO₄ (1 M) in D₂O

Each type of tungsten its representative chemical shift range (fig. 2).

Fig. 2. Chemical shift ranges for tungsten NMR

Tungsten shows couplings with other nuclei. One-bond couplings with fluorine are between 20 and 70 Hz. One-bond couplings to ³¹P are of the order of 250 Hz. With ⁵¹V, two-bond couplings of up to 26 Hz are observed. Couplings are also reported with ¹⁰B, ¹¹B and ²⁹Si. In polytungstates, homonuclear couplings (two-bond between 5 and 30 Hz) appear as satellite signals in the tungsten spectrum allowing the use of 2D-INADEQUATE for spectral assignment as with ¹³C-NMR.

Properties of ¹⁸³W

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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, tungsten salts are toxic: wear protective gloves.

References

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• B. J. Smith and V. A. Patrick, "Tungsten NMR spectra of the α- and β-isomers of Na₈[SiW₁₁O₃₉]", Aust. J. Chem., 56, 283-286 (2003).
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