Structural studies of copper(II)-amine terminated dendrimer complexes by EXAFS

Tran, M. Linh, Gahan, Lawrence R. and Gentle, Ian R. (2004) Structural studies of copper(II)-amine terminated dendrimer complexes by EXAFS. Journal of Physical Chemistry B, 108 52: 20130-20136. doi:10.1021/jp037569h

Author Tran, M. Linh
Gahan, Lawrence R.
Gentle, Ian R.
Title Structural studies of copper(II)-amine terminated dendrimer complexes by EXAFS
Journal name Journal of Physical Chemistry B   Check publisher's open access policy
ISSN 1520-6106
Publication date 2004-01-01
Sub-type Article (original research)
DOI 10.1021/jp037569h
Volume 108
Issue 52
Start page 20130
End page 20136
Total pages 7
Place of publication Washington, D.C.
Publisher American Chemical Society
Language eng
Subject C1
250503 Characterisation of Macromolecules
780102 Physical sciences
Abstract The three-dimensional branched nature of dendritic macromolecules provides many potential sites per molecule for the complexation of metal ions. Therefore, dendrimers may act as hosts for metals with coordination potentially occurring at the periphery, the interior, or both. To understand further the complexation of dendrimers with metal ions EXAFS experiments were carried out. In this work, the interaction of amine-terminated polyamido(amine), PAMAM, dendrimer with copper(II) ions determined by EXAFS is reported. It was found that a model consisting of the copper(II) ion forming five- and six-membered rings by chelating with the primary amine, amide, and tertiary amine nitrogen donors of the PAMAM dendrimer could describe the experimental EXAFS data well. Corroborative evidence for binding to amide nitrogen donors comes from the broadening of NMR resonances of a copper(Il)-PAMAM mixture revealing the presence of paramagnetic copper(II) ions at these sites. The significance of the results presented in this paper is that copper(II) ions form complexes within the dendrimer structure and not just at the periphery. The current study may have implications for the use of PAMAM dendrimers as effective ligands in sensing systems.
Keyword Chemistry, Physical
Poly(amidoamine) Dendrimers
Starburst Dendrimers
Metal Nanoparticles
Q-Index Code C1
Additional Notes DOI: 10.1021/jp037569h

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Created: Wed, 15 Aug 2007, 13:46:08 EST