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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Photoinduced Intramolecular Electron-Transfer Processes in 60Fullerene-(Spacer)-N,N-Bis(biphenylyl)aniline Dyad in Solutions
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Photoinduced Intramolecular Electron-Transfer Processes in 60Fullerene-(Spacer)-N,N-Bis(biphenylyl)aniline Dyad in Solutions

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摘要

Intramolecular photoinduced charge-separation and charge-recombination processes in a covalently connected C6o-(spacer)-N,N-bis(biphenylyl)aniline (C_(60)-spacer-BBA) dyad,in which the center-to-center distance of the electron acceptor and electron donor is 15 A,have been studied by time-resolved fluorescence and transient absorption methods.The observed low fluorescence intensity and the short fluorescence lifetime of the C_(60) moiety of the dyad in PhCN and THF indicate that charge separation takes place via the excited singlet state of the C_(60) moiety at a quite fast rate and a high efficiency.The nanosecond transient absorption spectra in PhCN and THF showed the broad absorption bands at 880 and 1100 nm,which were attributed to C_(60)~(centre dot-)-spacer-BBA~(centre dot).The charge-separated state decays with a lifetime of 330-360 ns in PhCN and THF at room temperature.From temperature dependence of the charge-recombination rate constants,the reorganization energy was evaluated to be 0.77-0.87 eV,which indicates that the charge-recombination process is in the inverted region of the Marcus parabola.With lowering temperature,the contribution of charge separation via the excited triplet state of the C_(60) moiety increases due to an increase in solvation of C_(60)~(centre dot-)-spacer-BBA~(centre dot+).

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