The effect of macromolecular architecture in nanomaterials: A comparison of site isolation in porphyrin core dendrimers and their isomeric linear analogues

Eva M. Harth, Stefan Hecht, Brett Helms, Eva E. Malmstrom, Jean Frechet, Craig J. Hawker*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

154 Scopus citations

Abstract

The influence of macromolecular architecture on the physical properties of polymeric materials has been studied by comparing poly(benzyl ether) dendrons with their exact linear analogues. The results clearly confirm the anticipation that dendrimers are unique when compared to other architectures. Physical properties, from hydrodynamic volume to crystallinity, were shown to be different, and in a comparative study of core encapsulation in macromolecules of different architecture, energy transduction from the polymer backbone to a porphyrin core was shown to be different for dendrimers as compared to that of isomeric four- or eight-arm star polymers. Fluorescence excitation revealed strong, morphology dependent intramolecular energy transfer in the three macromolecular isomers investigated. Even at high generations, the dendrimers exhibited the most efficient energy transfer, thereby indicating that the dendritic architecture affords superior site isolation to the central porphyrin it surrounds.

Original languageEnglish (US)
Pages (from-to)3926-3938
Number of pages13
JournalJournal of the American Chemical Society
Volume124
Issue number15
DOIs
StatePublished - Apr 17 2002

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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