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LinChen. Solvent dependence on the photophysical and photochemical behaviors of thioxanthen-9-one[J]. Chinese Journal of Chemical Physics .
Citation: LinChen. Solvent dependence on the photophysical and photochemical behaviors of thioxanthen-9-one[J]. Chinese Journal of Chemical Physics .

Solvent dependence on the photophysical and photochemical behaviors of thioxanthen-9-one

  • Accepted Date: 2020-07-02
  • The solvent dependence on the photophysical and photochemical behaviors of thioxanthen-9-one (TX) has been investigated by the nanosecond laser flash photolysis. In the transient absorption spectra of TX in CH3CN, the band at 627 nm is attributed to the triplet TX (3TX*). The self-quenching rate constant ksq of 3TX* is reduced in the protic solvents. This may be due to the fact that the exciplex being formed by hydrogen bonding effect probably could influence the process of collisional quenching of 3TX*. In the presence of DPA, reduction of 3TX* occurs via a typical two-step mechanism of the electron/proton transfer. The bands at ~420 nm, ~683 nm and ~780 nm in CH3CN are respectively assigned to TXH? radical, TX?? anion radical and DPA?+ cation radical. No obvious medium effect is observed for the electron transfer between 3TX* and DPA, which indicates the 3nπ* and 3ππ* states of TX should have the approximate ability to attract electron. However, a solvent dependence is found in the dynamic decay of TX?? anion radical. In the strongly acid aqueous acetonitrile (pH=3.0), a dynamic equilibrium between protonated and unprotonated TX is observed. Once photolysis, 3TXH+* is produced, which contributes to the new band at 520 nm.
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通讯作者: 陈斌, bchen63@163.com
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Solvent dependence on the photophysical and photochemical behaviors of thioxanthen-9-one

Abstract: The solvent dependence on the photophysical and photochemical behaviors of thioxanthen-9-one (TX) has been investigated by the nanosecond laser flash photolysis. In the transient absorption spectra of TX in CH3CN, the band at 627 nm is attributed to the triplet TX (3TX*). The self-quenching rate constant ksq of 3TX* is reduced in the protic solvents. This may be due to the fact that the exciplex being formed by hydrogen bonding effect probably could influence the process of collisional quenching of 3TX*. In the presence of DPA, reduction of 3TX* occurs via a typical two-step mechanism of the electron/proton transfer. The bands at ~420 nm, ~683 nm and ~780 nm in CH3CN are respectively assigned to TXH? radical, TX?? anion radical and DPA?+ cation radical. No obvious medium effect is observed for the electron transfer between 3TX* and DPA, which indicates the 3nπ* and 3ππ* states of TX should have the approximate ability to attract electron. However, a solvent dependence is found in the dynamic decay of TX?? anion radical. In the strongly acid aqueous acetonitrile (pH=3.0), a dynamic equilibrium between protonated and unprotonated TX is observed. Once photolysis, 3TXH+* is produced, which contributes to the new band at 520 nm.

LinChen. Solvent dependence on the photophysical and photochemical behaviors of thioxanthen-9-one[J]. Chinese Journal of Chemical Physics .
Citation: LinChen. Solvent dependence on the photophysical and photochemical behaviors of thioxanthen-9-one[J]. Chinese Journal of Chemical Physics .

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