NEW NITROGEN-CONTAINING MACROCYCLIC LIGANDS COVALENTLY ATTACHED TO SILICA GEL AND THEIR USE IN SEPARATING METAL CATIONS

Several polyaza-crowns and cyclams, each containing an allyl-oxymethyl or other monofunctional group capable of further reaction to attach it to silica gel, have been prepared. As an example of an attachment of a crown to silica gel, allyloxymethyl-substituted diaza-18-crown-6 was reacted with triet...

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Bibliographic Details
Published in:Solvent extraction and ion exchange 1989-01, Vol.7 (5), p.855-864
Main Authors: Bradshaw, Jerald S., Krakowiak, Krzysztof E., Tarbet, Bryon J, Bruening, Ronald L., David Griffin, L., Cash, David E., Rasmussen, Trent D., Izatt, Reed M.
Format: Article
Language:English
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Summary:Several polyaza-crowns and cyclams, each containing an allyl-oxymethyl or other monofunctional group capable of further reaction to attach it to silica gel, have been prepared. As an example of an attachment of a crown to silica gel, allyloxymethyl-substituted diaza-18-crown-6 was reacted with triethoxysilane to form the crown-substituted triethoxysilane This crown-silane material was heated on silica gel to effect a covalent attachment of the crown. The silica gel-bound macrocyclic ligands were found to interact with various metal cations with log K ( H2O) values similar to those of the same cations with unbound macrocycles. A tetraaza-crown bound to silica gel was found to quantitatively remove toxic heavy metal ions, such as Pb 2+ , Hg 2+ Cd 2+ Ag + and others at the ppb level, from large volumes of aqueous solutions containing those metal ions and much larger amounts of Na + Mg 2+ and Ca 2+ ions
ISSN:0736-6299
1532-2262
DOI:10.1080/07360298908962341