Photoisomerization in dendrimers by harvesting of low-energy photons
Infrared radiation can induce low-frequency molecular vibrations, but, with the exception of hydrogen-bond reorganization, 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 i...
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| Veröffentlicht in: | Nature (London) 1997-07, Vol.388 (6641), p.454-456 |
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| creator | Aida, Takuzo Jiang, Dong-Lin |
| description | Infrared radiation can induce low-frequency molecular vibrations, but, with the exception of hydrogen-bond reorganization, 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 dendrimers 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. |
| doi_str_mv | 10.1038/41290 |
| format | Article |
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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 dendrimers 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. 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| ispartof | Nature (London), 1997-07, Vol.388 (6641), p.454-456 |
| issn | 0028-0836 1476-4687 |
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| source | Nature Journals Online; SpringerLink Journals - AutoHoldings |
| subjects | Chemical reactions Chemistry Energy Energy transfer Exact sciences and technology General and physical chemistry Harvest Infrared radiation Light Molecules Photochemistry Physical chemistry of induced reactions (with radiations, particles and ultrasonics) |
| title | Photoisomerization in dendrimers by harvesting of low-energy photons |
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