Photoinduced electron transfer from triplet states of phthalocyanines to fullerenes studied by transient absorption spectroscopies in visible and near‐IR regions
Photoinduced electron transfer from triplet states of phthalocyanines to fullerenes studied by transient absorption spectroscopies in visible and near‐IR regions
复制标题
通过可见光和近红外区域的瞬态吸收光谱研究从酞菁三重态到富勒烯的光致电子转移
DOI：
10.1002/1099-1409(200012)4:8
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发表时间：
2000
影响因子：
1.5
通讯作者：
O. Ito
中科院分区：
文献类型：
--
作者：
Mohamed E. El‐Khouly;Shafiqul Islam;M. Fujitsuka;O. Ito
通过观察C60/C70在可见光和近红外区的瞬时吸收光谱，研究了在极性溶剂中C60/C70与四叔丁基酞菁(H_2TBPc)及其锌衍生物(ZTbPc)之间的光致电子转移过程。在极性溶剂中，用670 nm激光脉冲主要激发TBPcs，观察到和的瞬时吸收带增长，同时伴随着TBPcs(3TBPc*)三重态的衰变。从而证实了在极性溶剂中，电子通过3TBPc*发生转移。由于3ZnTbPc*的电子喷射能力，3ZnTBPc*的电子转移速率常数和电子转移效率均大于3H_2TBPc*。研究了溶剂对正向和反向电子转移过程的影响。
Photoinduced electron transfer processes between C60/C70 and phthalocyanines such as tetra-tert-butylphthalocyanine (H2TBPc) and its zinc derivative (ZnTBPc) in polar solvents have been studied by observing the transient absorption spectra in the visible and near-IR regions. Upon predominant excitation of TBPcs with a 670 nm laser pulse in polar solvents, growth of the transient absorption bands of and was observed, accompanied by a concurrent decay of the triplet states of TBPcs (3TBPc*). Thus it is confirmed that electron transfer occurs via 3TBPc* in polar solvents. The electron transfer rate constants and efficiencies of electron transfer via 3ZnTBPc* are greater than those via 3H2TBPc* owing to the electron ejection ability of 3ZnTBPc*. Solvent effects on the forward and backward electron transfer processes have been evaluated.