Selective chromogenic reagents based upon phenolic cryptands
- 1 January 1992
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Chemical Communications
- No. 23,p. 1716-1718
- https://doi.org/10.1039/c39920001716
Abstract
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.Keywords
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