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Issue 10, 2013
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Photoinduced charge-transfer dynamics of sequentially aligned donor–acceptor systems in an ionic liquid

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Abstract

Photoinduced charge separation processes of linear phenyleneethynylene derivatives (PEN) with different sequences of electron-withdrawing perfluorophenyl groups (A) and electron-donating phenyl groups (D) were investigated in an ionic liquid (IL), BmimTFSI, by picosecond time-resolved fluorescence (TRF) and transient absorption (TA) spectroscopies. Very rapid photoinduced charge separation within 10 ps in AADD was followed by the stabilization of the charge-transfer (CT) state by the solvation, while the excited states in ADAD and ADDA were ascribable to the locally excited (LE) state. Equilibrium between the LE and CT states was established for DAAD with time constants of forward and backward processes much faster than the solvation time. The relative population of the CT state increases with time owing to the dynamic stabilization of the CT state by the solvation. The elementary charge separation process, the increase in the CT population, and their relation to the solvation time were discussed.

Graphical abstract: Photoinduced charge-transfer dynamics of sequentially aligned donor–acceptor systems in an ionic liquid

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Article information


Submitted
29 Jun 2013
Accepted
01 Aug 2013
First published
06 Aug 2013

Photochem. Photobiol. Sci., 2013,12, 1885-1894
Article type
Paper

Photoinduced charge-transfer dynamics of sequentially aligned donor–acceptor systems in an ionic liquid

M. Muramatsu, T. Katayama, S. Ito, Y. Nagasawa, D. Matsuo, Y. Suzuma, L. Peng, A. Orita, J. Otera and H. Miyasaka, Photochem. Photobiol. Sci., 2013, 12, 1885
DOI: 10.1039/C3PP50198A

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