Chloroform solutions of the chromoionophore 4c, which has been synthesised by a simple procedure from diaza-15-crown-5 2a, extract lithium cations from aqueous solutions in the pH range 7–8 with very high selectivity as compared with the extraction of sodium, potassium, magnesium and calcium; the related reagent 5 shows moderate selectivity for sodium.
A. F. Sholl and I. O. Sutherland, J. Chem. Soc., Chem. Commun., 1992, 1716 DOI: 10.1039/C39920001716
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