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

被引：203

作者：

Hirata, N

Lagref, JJ

Palomares, EJ

Durrant, JR

Nazeeruddin, MK

Gratzel, M

Di Censo, D

机构：

[1] Univ London Imperial Coll Sci & Technol, Dept Chem, Ctr Elect Mat & Devices, London SW7 2AY, England

[2] Swiss Fed Inst Technol, Sch Basic Sci, Inst Mol & Biol Chem, Lab Photon & Interfaces, CH-1015 Lausanne, Switzerland

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2004年 / 10卷 / 03期

关键词：

dyes/pigments; electron transfer; ruthenium; supramolecular chemistry;

D O I：

10.1002/chem.200305408

中图分类号：

O6 [化学];

学科分类号：

0703 ;

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.

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收藏

页码：595 / 602

页数：8

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