Tuning the Excited-State Energy of the Organic Chromophore in Bichromophoric Systems Based on the RuII Complexes of Tridentate Ligands
作者:Elaine A. Medlycott、Garry S. Hanan、Frédérique Loiseau、Sebastiano Campagna
DOI:10.1002/chem.200601376
日期:2007.3.26
from the anthracene triplet at 77 K; 2 e (the bromo-substituted anthryl-containing heteroleptic metal compound) exhibits anthryl-based emission at 77 K and MLCT emission at room temperature, but with a prolonged lifetime, thus suggesting equilibration between two triplet states that belong to different chromophores. The equilibration regime between MLCT and aromatic hydrocarbon triplet states is therefore
制备了一系列含有不同取代的双(吡啶基)三嗪配体的新型杂合和均杂Ru(II)配合物,它们的吸收光谱,氧化还原行为和发光特性(均在室温下在流体溶液中以及在77 K的刚性基质中) )已被调查。对于某些化合物,还确定了X射线结构。新的双(吡啶基)三嗪结合了其他生色团,例如联苯,菲,蒽和溴蒽衍生物,因此Ru(II)物种可以被认为是多发色物种。所有金属络合物的吸收光谱和氧化还原特性已被归为属于特定亚基的特征,因此表明这些物种可被视为多组分,从电子耦合的角度看超分子组装。尽管大多数复合物均具有发光性质,这可归因于涉及金属基亚基的金属至配体电荷转移(MLCT)状态,但含有蒽基和溴化蒽基发色团的物质却表现出复杂的发光行为。例如,2 d(含蒽的杂金属化合物)在室温下显示MLCT发射,在77 K下显示出蒽三联体的发射。2 e(含溴取代的蒽基杂合金属化合物)在77 K时显示基于蒽基的发射,在室温下显示MLCT发射