(⁶⁷Zn) Zinc NMR

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⁶⁷Zinc (⁶⁷Zn) is the only NMR active nucleus of zinc. It is a low sensitivity nucleus that yields moderately broad lines in symmetric environments over a very wide chemical shift range (fig. 1). For larger complexes and molecules, the signals become too broad to observe with a high-resolution NMR spectrometer. ⁶⁷Zn NMR is used for studying small complexes of zinc and for relaxation studies of zinc binding. There is little information available about chemical shifts (fig. 2).

Fig. 1. ⁶⁷Zn-NMR spectrum of ZnClO₄ (1M) in D₂O

Fig. 2. Chemical shift ranges for zinc NMR

Many NMR probes contain zinc that can cause a background signal to be observed (fig. 3).

Fig. 3. Background ⁶⁷Zn-NMR signal arising from zinc in the probe

Properties of ⁶⁷Zn

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References

• B. W. Epperlein, H. Krueger, O. Lutz, A. Schwenk, "Fourier transform nuclear magnetic resonance studies of zinc-67" Z. Naturforschung A., 29, 1533-1557 (1974).
• G. E. Maciel, L. Simeral, J. J. H. Ackerman, "Effect of Complexation of Zinc(II) on Zinc-67 Chemical Shifts" J. Phys. Chem., 81, 263-267 (1977).

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, ZnClO₄ is toxic: wear gloves. Zinc salts are toxic in very high doses.