Two-photon-induced cycloreversion reaction of coumarin photodimers

被引：70

作者：

Kim, HC

Kreiling, S

Greiner, A

Hampp, N ^{[1
]}

机构：

[1] Univ Marburg, Inst Phys Nucl & Macromol Chem, D-35032 Marburg, Germany

[2] Univ Marburg, Ctr Mat Sci, D-35032 Marburg, Germany

来源：

CHEMICAL PHYSICS LETTERS | 2003年 / 372卷 / 5-6期

关键词：

D O I：

10.1016/S0009-2614(03)00535-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 x 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. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：899 / 903

页数：5

共 25 条

[1] Photophysical and photochemical properties of 5,7-dimethoxycoumarin under one- and two-photon excitation [J].