Supramolecular Control of Charge-Transfer Dynamics on Dye-sensitized Nanocrystalline TiO2 Films
作者:Narukuni Hirata、Jean-Jacques Lagref、Emilio J. Palomares、James R. Durrant、M. Khaja Nazeeruddin、Michael Gratzel、Davide Di Censo
DOI:10.1002/chem.200305408
日期:2004.2.6
excitation of the modified dye adsorbed to nanocrystalline TiO(2) 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
[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。改性染料吸附到纳米晶体TiO(2)薄膜上的光激发显示出显着长寿命的电荷分离状态,衰减半衰期为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TiO(2)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所预测的大小一致。