Effect of Structure on Electron Transfer Reactions between Anthracene Dyes and TiO2 Nanoparticles
Effect of Structure on Electron Transfer Reactions between Anthracene Dyes and TiO2 Nanoparticles
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DOI：
10.1021/jp982740o
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发表时间：
1998-11
影响因子：
3.3
通讯作者：
I. Martini;J. Hodak;G. Hartland
中科院分区：
文献类型：
--
作者：
I. Martini;J. Hodak;G. Hartland
已经对蒽甲酸的 1-、2-和 9-异构体进行了光诱导电子转移到 TiO2 纳米颗粒的研究。这些实验使用了具有锐钛矿或非晶晶体结构的 TiO2 样品。时间分辨瞬态吸收测量的结果表明，正向（染料到半导体）和反向（半导体到染料）电子转移反应的速率取决于染料的化学结构和用于合成颗粒的方法。这些效应是由反应的能量学和耦合元素的差异引起的。具体来说，由于染料分子氧化电位的差异，1-异构体和2-异构体的反向电子转移反应明显快于9-异构体。此外，与无定形颗粒相比，锐钛矿型 TiO2 颗粒的正向和反向电子转移时间都更快。例如，锐钛矿的正向电子转移时间......
Photoinduced electron transfer to TiO2 nanoparticles has been examined for the 1-, 2-, and 9-isomers of anthracenecarboxylic acid. TiO2 samples with either anatase or amorphous crystal structures were used for these experiments. The results from time-resolved transient absorption measurements show that the rates of the forward (dye-to-semiconductor) and reverse (semiconductor-to-dye) electron transfer reactions depend on the chemical structure of the dye and the method used to synthesize the particles. These effects arise from differences in both the energetics and the coupling elements for the reactions. Specifically, the reverse electron transfer reactions for the 1- and 2-isomers are significantly faster than that for the 9-isomer due to differences in the oxidation potentials of the dye molecules. In addition, both the forward and reverse electron-transfer times are faster for the anatase TiO2 particles compared to the amorphous particles. For example, the forward electron transfer time for the anatas...