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Photoisomerization in dendrimers by harvesting of low-energy photons

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  • Dong-Lin Jiang

    (Precursory Research for Embryonic Science and Technology, Japan Science and Technology Corporation
    Graduate School of Engineering, The University of Tokyo)

  • Takuzo Aida

    (Precursory Research for Embryonic Science and Technology, Japan Science and Technology Corporation
    Graduate School of Engineering, The University of Tokyo)

Abstract

Infrared radiation can induce low-frequency molecular vibrations, but, with the exception of hydrogen-bond reorganization1,2,3, the excitation energy tends to be dissipated rapidly through molecular collisions rather than inducing photochemical changes. Here we show that in a macromolecular system that is designed to be insulated against collisional energy scattering, infrared absorption can excite photoisomerization by multiphoton intramolecular energy transfer. We have prepared highly branched dendrimers4,5,6 from aryl ethers with a photoisomerizable azobenzene core, in which infrared excitation of the aromatic units is apparently followed by a channelling of the absorbed energy to the core while the dendrimer matrix protects against collisional de-excitation. These findings suggest a strategy for harvesting low-energy photons to effect chemical transformations.

Suggested Citation

  • Dong-Lin Jiang & Takuzo Aida, 1997. "Photoisomerization in dendrimers by harvesting of low-energy photons," Nature, Nature, vol. 388(6641), pages 454-456, July.
    • Handle: RePEc:nat:nature:v:388:y:1997:i:6641:d:10.1038_41290
    DOI: 10.1038/41290
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