NEW PHOTOMETRIC REAGENTS FOR ALKALI METAL IONS BASED ON CROWN ETHER COMPLEX FORMATION
- 5 September 1981
- journal article
- Published by Oxford University Press (OUP) in Chemistry Letters
- Vol. 10 (9) , 1305-1306
- https://doi.org/10.1246/cl.1981.1305
Abstract
Two chromogenic crown ethers, N-(2-hydroxy-5-nitrobenzyl)-aza-15-crown-5(1) and N-(2-hydroxy-5-nitrobenzyl)-aza-18-crown-6(2), were synthesized for the extraction photometry of alkali metal ions. The extraction selectivity followed the order: 1, Li+>Na+>K+>>Rb+, Cs+ and 2, K+>Na+>Rb+>Li+>Cs+. 1 is useful for determining 10–100 ppm Li+ as well as for concentrating Li+ from a dilute solution.Keywords
This publication has 2 references indexed in Scilit:
- Complexation and extraction of alkali metal ions by 4'-picrylaminobenzo-18-crown-6 derivativesAnalytical Chemistry, 1980
- Spherands - ligands whose binding of cations relieves enforced electron-electron repulsionsJournal of the American Chemical Society, 1979