Photo-induced intramolecular electron transfer of fluorescein-anthraquinone-methyl ester and detection of its charge-separated state | Health & Environmental Research Online (HERO)

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Citation
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HERO ID

7558525

Reference Type

Journal Article

Title

Photo-induced intramolecular electron transfer of fluorescein-anthraquinone-methyl ester and detection of its charge-separated state

Author(s)

Zhang, HP; Zhou, YL; Zhang, MH; Shen, T; Li, YL; Zhu, DB; ,

Year

2003

Is Peer Reviewed?

Journal

Gaodeng Xuexiao Huaxue Xuebao / Chemical Journal of Chinese Universities
ISSN: 0251-0790

Publisher

HIGHER EDUCATION PRESS

Location

BEIJING

Page Numbers

492-495

Web of Science Id

WOS:000182511900028

Abstract

The diad composed of fluorescein and 2-methyl-anthraquinone (FL-AQ) has been synthesized and its photophysical properties, have been examined by absorption, fluorescence spectroscopy and fluorescence lifetime. The charge separated state formed by photo-induced intramolecular electron transfer has been detected by nanosecond transient absorption spectroscopy for the first time. When FL is excited in solution, the photo-induced electron transter from FL to AQ proceed's efficiently. The rate constant and the efficiency of intramolecular electron transfer are 3. 95 x10(9) s(-1) and 95% respectively. Its charge-separated state lifetime is too short to detect obviously by transient Absorption spectroscopy. Adding of nanometersize TiO2 colloids to FL-AQ ethanol solution can prolong the lifetime of charge-separated state, so its transient absorption signal is recorded significantly. The decay lifetime of FL+. at 480 nm is 11. 1 mus. The decay lifetime of AQ(-.) at 60 nm is 8. 93 mus.