Self-assembly and electrochemical oxidation of polyamidoamine - Carbazole dendron surfmer complexes: Nanoring formation

Chatthai Kaewtong, Guoqian Jiang, Mary Jane Felipe, Buncha Pulpoka, Rigoberto Advincula

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

We report a detailed and quantitative study on the supramolecular complexation of amine-functionalized polyamidoamine (PAMAM) dendrimer G4-NH2 with carboxylic acid terminal dendrons containing peripheral electroactive carbazole groups of different generations (G0COOH, G1COOH, and G2COOH). While the focus is on a detailed understanding and mechanism of complex formation, subsequent electrochemical oxidation of the dendron surfmers resulted in the formation of nanoring structures electrodeposited on the conducting substrate. Complexation was confirmed by NMR, UV-vis, and IR measurements. Critical micelle concentration (CMC), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS) studies revealed that the ringlike structures were formed during the equilibrium - decomplexation stage and that the electrochemical process did not destroy the complex but rather stabilized it. The different generations of the dendrons provided various structures and complex formation efficacy. This type of template polymerization combined with electrochemically anodic oxidation has not been previously reported.

Original languageEnglish
Pages (from-to)1533-1542
Number of pages10
JournalACS Nano
Volume2
Issue number8
DOIs
Publication statusPublished - 2008 Aug
Externally publishedYes

Keywords

  • Carbazole dendron
  • Complexation
  • Nanoring
  • PAMAM
  • Template polymerization

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

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