Poly(amidoamine) Dendrimers: A New Class of High Capacity Chelating Agents for Cu(II) Ions

This communication describes preliminary results of an experimental investigation of the binding of Cu(II) ions to poly(amidoamine) (PAMAM) dendrimers in aqueous solutions. Dendrimers are highly branched polymers with controlled composition and architecture consisting of three structural components:...

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Bibliographic Details
Published in:	Environmental science & technology Vol. 33; no. 5; pp. 820 - 824
Main Authors:	Diallo, Mamadou S, Balogh, Lajos, Shafagati, Abdul, Johnson, James H, Goddard, William A, Tomalia, Donald A
Format:	Journal Article
Language:	English
Published:	Washington, DC American Chemical Society 01-03-1999
Subjects:	Applied sciences Chemistry Copper Exact sciences and technology Ions Miscellaneous Organic polymers Physicochemistry of polymers Polymers Properties and characterization Copper II Amino group End group Branched polymer Metal ion Experimental study Molecular weight property relation Amidoamine polymer Binding capacity Aliphatic polymer Chelating agent Aqueous solution Dendritic structure
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Summary:	This communication describes preliminary results of an experimental investigation of the binding of Cu(II) ions to poly(amidoamine) (PAMAM) dendrimers in aqueous solutions. Dendrimers are highly branched polymers with controlled composition and architecture consisting of three structural components: a core, interior branch cells, and terminal branch cells. PAMAM dendrimers possess functional nitrogen and amide groups arranged in regular “branched upon branched” patterns which are displayed in geometrically progressive numbers as a function of generation level. Terminal groups of PAMAM dendrimers may be any organic substituent such as primary amines, carboxylic groups, etc. In aqueous solutions, PAMAM dendrimers can serve as high capacity nanoscale containers for toxic metal ions such as Cu(II). Compared to traditional chelating agents (e.g., triethylene tetramine) and macrocyles (e.g., cyclams) with nitrogen donors, which can typically bind only one Cu(II) ion per molecule, a generation eight (G8) PAMAM dendrimer can bind up 153 ± 20 Cu(II) ions per molecule. This clearly illustrates a distinct advantage of dendrimers over traditional chelating agents and macrocycles; that is the covalent attachment of nitrogen ligands to conformationally flexible PAMAM chains enclosed within a nanoscopic structure results in a substantial increase in binding capacity.
Bibliography:	ark:/67375/TPS-PXR3PM3J-9 istex:01C3AA71AF6EDA33B9E92DFA44897EFF90AA3C0D ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0013-936X 1520-5851
DOI:	10.1021/es980521a