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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Solvent Polarity Dependence of Photoinduced Charge Separation in a Tetrathiophene-C_(60) Dyad Studied by Pico- and Nanosecond Laser Flash Photolysis in the Near-IR Region
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Solvent Polarity Dependence of Photoinduced Charge Separation in a Tetrathiophene-C_(60) Dyad Studied by Pico- and Nanosecond Laser Flash Photolysis in the Near-IR Region

机译：通过近红外区皮秒和纳秒激光闪光光解研究的四噻吩-C_（60）Dyad中的光诱导电荷分离的溶剂极性依赖性

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摘要

Photoinduced charge separation and recombination processes in a tetrathiophene-C_(60) dyad molecule (4T-C_(60)) in various solvents were investigated by observing transient absorption spectra in the near-IR region. In polar solvents such as tetrahydrofuran and benzonitrile, charge separation occurred at a rate on the order of 10~(10) s~(-1), which decreased down to the order of 10~9 s~(-1) in moderately polar solvents. In nonpolar toluene, charge separation was not observed. The quantum yields for the charge separations were nearly unity in polar solvents. Charge recombination occurred in 100 ps - 10 ns; the shorter lifetimes occurred in the highly polar solvents. After recombination, the triplet excited state of C_(60) was generated predominantly. In polar solvents such as benzonitrile, the charge-separated state was also observed in the microsecond time region. To explain the unprecedented long lifetime of the second charge-separation step, an equilibrium between the charge-separated state and the triplet excited state was taken into consideration.
机译：通过观察近红外区域的瞬态吸收光谱，研究了四噻吩-C_（60）二元分子（4T-C_（60））在各种溶剂中的光诱导电荷分离和重组过程。在四氢呋喃和苄腈等极性溶剂中，电荷分离发生的速率约为10〜（10）s〜（-1），在中等极性下降低至10〜9 s〜（-1）。溶剂。在非极性甲苯中，未观察到电荷分离。在极性溶剂中，电荷分离的量子产率几乎为1。电荷重组发生在100 ps-10 ns;高极性溶剂的寿命越短。重组后，主要产生C_（60）的三重激发态。在诸如苄腈之类的极性溶剂中，在微秒时间范围内也观察到电荷分离状态。为了解释第二电荷分离步骤的空前的长寿命，考虑了电荷分离状态和三重激发态之间的平衡。

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