A chromogenic reagent for calcium. The importance of ion-pairing in cation selection

A Mason, IO Sutherland

Index: Mason, Andrew; Sutherland, Ian O. Journal of the Chemical Society, Chemical Communications, 1994 , # 9 p. 1131 - 1132

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Abstract

The chromoionophore 2 has been synthesised from the corresponding diaza 18-crown-6 in two steps in good overall yield, and the reagent 2 extracts calcium cations from aqueous solutions in the pH range 7–9 with moderately high selectivity as compared with sodium and with high selectivity as compared with other cations of biological interest; the series of apparently similar reagents 2, 3 and 4 shows very wide variation in Na+/Ca2+ selectivity.

~97%

Synthesis, NMR Studies and Crystal Structure of Cryptand 4, ...

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Synthesis of N-unsubstituted di-and triaza crown ethers.

[Maeda; Furuyoshi; Nakatsuji; Okahara Bulletin of the Chemical Society of Japan, 1983 , vol. 56, # 10 p. 3073 - 3077]