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Supramolecular control of charge-transfer dynamics on dye-sensitized nanocrystalline TiO2 films

机译:染料敏化纳米晶TiO2薄膜的超分子控制电荷转移动力学

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摘要

A [Ru(dcbpy)(2)(NCS)(2)] dye has been chemically modified by the addition of a secondary electron donor moiety, N,N-(di-p-anisylamino)phenoxymethyl. Optical excitation of the modified dye adsorbed to nanocrystalline TiO2 films shows a remarkably long-lived charge-separated state, with a decay half time of 0.7 s. Semiempirical calculations confirm that the HOMO of the modified dye molecule is localised on the electron donor group. The retardation of the recombination dynamics relative to the unmodified control dye is caused by the increase in the spatial separation of the HOMO orbital from the TiO2 surface. The magnitude of the retardation is shown to be in agreement with that predicted from the non-adiabatic electron-tunnelling theory. [References: 27]
机译:[Ru(dcbpy)(2)(NCS)(2)]染料已通过添加仲电子给体部分N,N-(di-p-茴香基氨基)苯氧基甲基进行了化学修饰。吸附到纳米晶TiO2薄膜上的改性染料的光激发显示出长寿命的电荷分离状态,其半衰期为0.7 s。半经验计算证实,修饰的染料分子的HOMO位于电子给体基团上。相对于未修饰的对照染料,重组动力学的延迟是由于HOMO轨道与TiO2表面的空间间隔增加而引起的。延迟的大小显示与非绝热电子隧道理论预测的大小一致。 [参考:27]

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