Effective photocrosslinking reaction of dendrimers through triplet energy transfer

Seiichi Furumi, Akira Otomo, Shiyoshi Yokoyama, Shinro Mashiko

Research output: Contribution to journalConference article

11 Citations (Scopus)

Abstract

In this article, we describe the synthesis and photoreactions of photocrosslinkable dendrimers bearing trans-cinnamoyl residues at the peripheral positions. Photoirradiation of the dendrimers with 313 nm gave rise to monotonous decrease in the absorbance of trans-cinnamates at 270 nm as a result of their photochemical reactions involving trans-to-cis photoisomerization and [2+2] photodimerization. The first-generation dendrimer displayed the preferential formation of cis-cinnamates at the photostationary state, whereas the photodimerization took place favorably for the third- and fifth-generation dendrimers. The photodimerized rate was strongly dependent on the dendritic generation rather than the concentration of solutions, probably due to the extent of steric crowding among the cinnamates settled on the dendritic surfaces. The third- and fifth-generation dendrimers enabled the capturing of a phosphorescent sensitizer into the internal dendritic cavities to generate the effective photocrosslinking of the cinnamates in an intramacromolecular manner through triplet energy transfer from the excited sensitizer. The photocrosslinking reaction of dendrimers through the triplet energy transfer might provide potential applicabilities to design and fabricate novel optical and electrical molecular devices from the bottom-up approach.

Original languageEnglish
Pages (from-to)85-89
Number of pages5
JournalThin Solid Films
Volume438-439
DOIs
Publication statusPublished - Aug 22 2003
Externally publishedYes
EventThe 5th International Conference on Nano-Molecular Electronics - Kobe, Japan
Duration: Dec 10 2002Dec 12 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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