(⁵⁹Co) Cobalt NMR

⁵⁹Cobalt (⁵⁹Co) is a high sensitivity nucleus with a 100% natural abundance that yields somewhat broad lines even in symmetric environments and very broad lines for slightly larger complexes over an extremely wide chemical shift range. ⁵⁹Co is a spin 7/2 nucleus and is therefore quadrupolar. As a result, the signal width increases with asymmetry of the environment. The most common oxidation state of cobalt salts is Co(II). However, this is paramagnetic so cannot be observed on a high resolution NMR spectrometer. ⁵⁹Co NMR is observable for Co(III), Co(I) and some clusters that are formally Co(0) or Co(-I). ⁵⁹Co NMR is used for studying small Co complexes. Each type of cobalt compound has its characteristic chemical shift (fig. 1). A ⁵⁹Co spectrum of acqueous Na₃Co(NO₂)₆ is shown in fig. 2. The sample shows extra signals due to partial hydrolysis.

Fig. 1. Chemical shift ranges for cobalt NMR

Fig. 2. ⁵⁹Co spectrum Na₃Co(NO₂)₆ in D₂O

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Properties of ⁵⁹Co

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References

• S. C. F. Au-Yeung and D. R. Eaton, "The Solvent and Field Dependence of ⁵⁹Co NMR Linewidths", J. Magn. Reson., 52, 366-373 (1983).
• T. Richert, K. Elbayed, J. Raya, P. Granger, P. Braunstein and J. Rosé, "⁵⁹Co NMR in Tetrahedron Clusters", Magn. Reson. Chem., 34, 689-696 (1996).

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, cobalt salts are toxic.