AI Article Synopsis
- A dyad consisting of fluorescein and 2-methyl-anthraquinone was created and analyzed for its light-absorbing and fluorescent properties, revealing key details about its charge-separated state.
- Photoinduced electron transfer from fluorescein to anthraquinone occurred with a high efficiency of 95%, and the rate constant was measured at 3.95 x 10^9 s^(-1).
- The presence of colloidal TiO2 in the solution extended the lifetime of the charge-separated state, allowing its transient absorption signals to be effectively recorded, with lifetimes of charge-separated fluorescein and anthraquinone being 11.1 and 8.93 microseconds, respectively.
Article Abstract
A dyad composed of fluorescein and 2-methyl-anthraquinone (FL-AQ) was synthesized and its photophysical properties were examined by absorption, fluorescence spectroscopy, and fluorescence lifetime. The charge-separated state formed by photoinduced intramolecular electron transfer was detected by nanosecond transient absorption spectroscopy for the first time. When FL is excited in solution, the photoinduced electron transfer from FL to AQ proceeds efficiently. The rate constant and the efficiency of intramolecular electron transfer are 3.95 x 10(9) s(-1) and 95%, respectively. Its charge-separated state lifetime is too short to detect by transient absorption spectroscopy. Adding nanometer colloidal TiO(2) to an FL-AQ ethanol solution prolongs the lifetime of the charge-separated state, so its transient absorption signal is recorded significantly. The lifetimes of FL(+). at 480 nm and AQ(-). at 560 nm in the FL-AQ/TiO(2) colloidal system are 11.1 and 8.93 mivros, respectively.
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| http://dx.doi.org/10.1016/s0021-9797(03)00337-0 | DOI Listing |
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