SYNTHESIS OF NEW 14-CROWN-FORMAZAN AND 15-CROWN-FORMAZAN AND THEIR EVALUATION IN SPECTROPHOTOMETRIC DETERMINATION OF LITHIUM

Authors
IBRAHIM YA BARSOUM BN ELWAHY AHM KHELLA SK
Citation
Ya. Ibrahim et al., SYNTHESIS OF NEW 14-CROWN-FORMAZAN AND 15-CROWN-FORMAZAN AND THEIR EVALUATION IN SPECTROPHOTOMETRIC DETERMINATION OF LITHIUM, Supramolecular chemistry, 9(1), 1998, pp. 5-12
Citations number
13
Categorie Soggetti
Chemistry
Journal title
Supramolecular chemistry → ACNP
ISSN journal
10610278
Volume
9
Issue
1
Year of publication
1998
Pages
5 - 12
Database
ISI
SICI code
1061-0278(1998)9:1<5:SON1A1>2.0.ZU;2-T
Abstract
The two new crown-formazans 1 and 2 with 14- and 15-membered rings hav e been synthesized, characterized and investigated as a selective spec trophotometric chelating agents for lithium. The effect of sodium ion concentration on the background lithium signal was studied. Sodium cau ses depression of the lithium signal and the relative effect diminishe s as the total sodium concentration is increased. In a background sodi um containing 140 mM sodium, a 10 mM increment of sodium is equivalent to 0.0017 mM Lithium using compound 1 and 0.0024 mM using compound 2.