Two-photon-induced cycloreversion reaction of coumarin photodimers

Photochemical reactions induced by two-photon-absorption processes offer several advantages over common one-photon initiated photoreactions, e.g., three-dimensional spatial control. We present the photocleavage reaction of coumarin photodimers via a two-photon process using pulsed frequency-doubled...

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Bibliographic Details
Published in:Chemical physics letters 2003-05, Vol.372 (5), p.899-903
Main Authors: Kim, H-C., Kreiling, S., Greiner, A., Hampp, N.
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Photochemistry
Photochemistry and radiation chemistry
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
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Summary:Photochemical reactions induced by two-photon-absorption processes offer several advantages over common one-photon initiated photoreactions, e.g., three-dimensional spatial control. We present the photocleavage reaction of coumarin photodimers via a two-photon process using pulsed frequency-doubled Nd:YAG-laser light. The two-photon-induced cycloreversion reaction leads selectively to the cleavage of the coumarin photodimers resulting in the formation of monomeric coumarin molecules. The two-photon cross section of the coumarin photodimer was determined to be of 1.6×10 −52 cm 4 s photon −1 . The presented reaction is of interest, e.g., for the photo-triggered release of chemicals in areas which cannot be directly optically addressed due to cover layers which have a high absorption at the single-photon-absorption wavelength.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(03)00535-9