Department of Chemistry and Biochemistry, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358, USA.
Molecules. 2009 Sep 28;14(10):3851-67. doi: 10.3390/molecules14103851.
A family of dendritic tris-bipyridyl ruthenium coordination complexes incorporating two or four carboxylate groups for binding to a TiO(2) surface site and another dendritic linker between the metal complex and highly absorptive dyes were formulated as thin films on TiO(2) coated glass. The family included phenothiazine-substituted dendrons of increasing structural complexity and higher optical density. The dye-loaded films were characterized by steady-state emission and absorption measurements and by kinetic studies of luminescence and transient absorption. Upon photoexcitation of the bound dyes, rapid electron injection into the metal oxide film was the dominant observed process, producing oxidized dye that persisted for hundreds of milliseconds. Complex decay profiles for emission, transient absorption, and optical bleaching of the dendritic dyes point to highly heterogeneous behavior for the films, with observed persistence lifetimes related directly to structurally enhance electronic coupling between the metal oxide support and the dendritic dyes.
一个枝状三联吡啶钌配合物家族，包含两个或四个羧酸盐基团，用于结合到 TiO(2) 表面位点，以及一个金属配合物和高吸收染料之间的另一个枝状连接物，被设计为涂覆在 TiO(2) 玻璃上的薄膜。该家族包括结构复杂性和光学密度更高的吩噻嗪取代树突。负载染料的薄膜通过稳态发射和吸收测量以及发光和瞬态吸收的动力学研究进行了表征。在结合染料的光激发下，观察到的主要过程是快速电子注入金属氧化物薄膜，产生持续数百毫秒的氧化染料。对于发射、瞬态吸收和树枝状染料的光漂白的复杂衰减曲线表明，薄膜的行为具有高度不均匀性，观察到的持久寿命与金属氧化物载体和树枝状染料之间结构增强的电子偶联直接相关。
