文摘
Surface-bound, perylenediimide (PDI)-based molecular assemblies have been synthesized on nanocrystalline TiO2 by reaction of a dianhydride with a surface-bound aniline and succinimide bonding. In a second step, the Fe(II) polypyridyl complex [FeII(tpy-PhNH2)2]2+ was added to the outside of the film, also by succinimide bonding. Ultrafast transient absorption measurements in 0.1 M HClO4 reveal that electron injection into TiO2 by 1PDI* does not occur, but rather leads to the ultrafast formation of the redox-separated pair PDI鈥?,PDI鈥⑩€?/sup>, which decays with complex kinetics (蟿1 = 0.8 ps, 蟿2 = 15 ps, and 蟿3 = 1500 ps). With the added Fe(II) polypyridyl complex, rapid (<25 ps) oxidation of Fe(II) by the PDI鈥?,PDI鈥⑩€?/sup> redox pair occurs to give Fe(III),PDI鈥⑩€?/sup> persisting for >400 渭s in the film environment.