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, cesium salts are toxic in large quantities besides any toxicity arising from the anion.

¹³³Cs NMR

Cesium (Cs) has one medium sensitivity NMR active nucleus, ¹³³Cs (fig. 1). It is quadrupolar but has a very low quadrupole moment and is usually found in symmetric environments and yields narrow signals over a wide chemical shift range. ¹³³Cesium NMR is mostly used for studying cesium complexes and detecting binding.

Fig. 1. ¹³³Cs-NMR spectrum of CsCl (1 M) in D₂O

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

Fig. 2. Chemical shift ranges for cesium NMR

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Properties of ¹³³Cs

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References

1. J. H. Halliday, H. D. W. Hill, R. E. Richards, "Solvent isotope shifts of cesium resonances in dilute salt solutions", Chem. Commun., 219-220 (1969).
2. E. Mei, L. Liu, J. L. Dye and A. I. Popov, "Determination of stability constants of cesium[2]-cryptand complexes in nonaqueous solvents by cesium-133 NMR", J. Soln. Chem., 6, 771-778 (1977).
3. H. Gustavsson, T. Ericsson and B. Lindman, "¹³³Cs NMR chemical shifts in mixtures of NN-dimethylformamide and water", Norg. Nucl. Chem. Lett., 14, 37-43 (1978).
4. H. Gustavsson and B. Lindman, "Alkali ion binding to aggregates of amphiphilic compounds studied by nuclear magnetic resonance chemical shifts", J. Am. Chem. Soc., 100, 4647-4654 (1978).
5. S. Khazaeli, A. I. Popov and J. L. Dye "Cesium-133 nuclear magnetic resonance study of the complexation of cesium salts by 18-crown-6 in methylamine. 1. 1:1 complex formation", J. Phys. Chem., 86, 5018-5023 (1982).
6. G. Bonas and M. R. Vignon, "Cesium-133 nuclear magnetic resonance study of cyclogentiotriose peracetate-cesium picrate complexation in non-aqueos solutions", Carbohydr. Res., 192, 343-346 (1989).
7. V. N. Mirny, V. V. Trachevski and T. A Mirnaya, "Nuclear magnetic resonance study of cesium-133 in binary molten trifluoroacetate salt mixtures", Z. Naturforsch. A, 56, 288-290 (2001).
8. R. M. Wellard and W. R. Adam, "Functional hepatocyte cation compartmentation demonstrated with ¹³³Cs NMR", Magn. Reson. Med., 48, 810-818 (2002).

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