Characterization of photoinduced isomerization and intersystem crossing of the cyanine dye Cy3

Jia  K; Wan  Y; Xia  ADLi  SYGong  FBYang  GQ

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Characterization of photoinduced isomerization and intersystem crossing of the cyanine dye Cy3

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Several important photophysical properties of the cyanine dye Cy3 have been determined by laser flash photolysis. The triplet-state absorption and photoisomerization of Cy3 are distinguished by using the heavy-atom effects and oxygen-induced triplet -> triplet energy transfer. Furthermore, the triplet-state extinction coefficient and quantum yield of Cy3 are also measured via triplet-triplet energy-transfer method and comparative actinometry, respectively. It is found that the triplet -> triplet (T-1 -> T-n) absorptions of trans-Cy3 largely overlap the ground-state absorption of cis-Cy3. Unlike what occurred in Cy5, we have not observed the triplet-state T-1 -> T-n absorption of cis-Cy3 and the phosphorescence from triplet state of cis-Cy3 following a singlet excitation (S-0-S-1) of trans-Cy3, indicating the absence of a lowest cis-triplet state as an isomerization intermediate upon excitation in Cy3. The detailed spectra of Cy3 reported in this paper could help us interpret the complicated photophysics of cyanine dyes.

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《The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory》 |2007年第9期|1593-1597|共5页
作者
Jia K; Wan Y; Xia ADLi SYGong FBYang GQ;
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作者单位

Chinese Acad Sci, Inst Chem, State Key Lab Mol React Dynam, Beijing 100080, Peoples R China;

Chinese Acad Sci, Inst Chem, BNLMS, Beijing 100080, Peoples R China;

Chinese Acad Sci, Inst Chem, CAS Key Lab Photochem, Beijing 100080, Peoples R ChinaDresden, Max-Planck-Institut fur Chemische Physik fester Stoffe (MPI-CPfS);

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正文语种英语
中图分类物理化学（理论化学）、化学物理学;
关键词
FLUORESCENCE CORRELATION SPECTROSCOPY; SINGLE-MOLECULE SPECTROSCOPY; RESONANCE ENERGY-TRANSFER; ELECTRON-TRANSFER; PHOTOPHYSICAL PROPERTIES; THIACARBOCYANINE DYES; BACK-ISOMERIZATION; OXYGEN PRODUCTION; MEROCYANINE DYES; GLASS-SURFACE;

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Characterization of photoinduced isomerization and intersystem crossing of the cyanine dye Cy3

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