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Reversible pH manipulation of the fluorescence emission from sectorial poly(amido amine) dendrimers.

Authors
  • Wang, Yong
  • Niu, Shuhua
  • Zhang, Zhijuan
  • Xie, Yibing
  • Yuan, Chunwei
  • Wang, Haitao
  • Fu, Degang
Type
Published Article
Journal
Journal of Nanoscience and Nanotechnology
Publisher
American Scientific Publishers
Publication Date
Jul 01, 2010
Volume
10
Issue
7
Pages
4227–4233
Identifiers
PMID: 21128404
Source
Medline
License
Unknown

Abstract

The first to fourth generation (G1-G4) of sectorial poly(amido amine) (PAMAM) dendrimers with ethanolamine core and amino terminals are synthesized by a divergent route. Blue fluorescence emission from these dendrimers is observed. It is found that there is a remarkable difference in the fluorescence behavior for these different generations of dendrimers. The emission intensity of these dendrimers is almost linearly enhanced along with the increase of their concentrations. A significant pH-dependent profile of the fluorescence intensity is also observed. As the pH value decreases from 8 to 3, the fluorescence intensity increases almost linearly. Furthermore, the fluorescence intensity of the dendrimers shows a reversible behavior depending on pH value within the pH range from 3 to 11. This property enables the reversible manipulation of the fluorescence of these dendrimers by adjusting the pH values, which contributes to a potential application of these materials in fluorescent pH sensors.

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