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首页> 外文期刊>Chemistry: A European journal >Tuning the excited-state energy of the organic chromophore in bichromophoric systems based on the Ru-II complexes of tridentate ligands
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Tuning the excited-state energy of the organic chromophore in bichromophoric systems based on the Ru-II complexes of tridentate ligands

机译：基于Tridate配体的Ru-II复合物调整荧光体系中有机发色团的激发状态能量

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A series of new heteroleptic and homoleptic Ru-II complexes containing variously substituted bis(pyridyl)triazine ligands has been prepared and their absorption spectra, redox behaviour and luminescence properties (both in fluid solution at room temperature and in a rigid matrix at 77 K) have been investigated. For some compounds, X-ray structures have also been determined. The new bis(pyridyl)triazines incorporate additional chromophores, such as biphenyl, phenanthrene, anthracene and bromoanthracene derivatives, so the Ru-II species can be considered as multichromophoric species. The absorption spectra and redox properties of all the metal complexes have been assigned to features belonging to specific subunits, thus suggesting that these species can be regarded as multicomponent, supramolecular assemblies from an electronic coupling point of view. Whereas most of the complexes exhibit luminescence properties that can be attributed to metal-to-ligand charge-transfer (MLCT) states involving the metalbased subunit(s), the species containing the anthryl and, even more, the brominated anthryl chromophores exhibit complicated luminescence behaviour. For example, 2d (the anthryl-containing heteroleptic metal compound) exhibits MLCT emission at room temperature and emission from the anthracene triplet at 77 K; 2e (the bromosubstituted 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 reached by suitable substitution on the organic chromophore.
机译：已经制备了一系列含有各种取代的双（吡啶基）三嗪配体的新的异素和官Hu-II复合物，并制备了它们的吸收光谱，氧化还原行为和发光性质（在室温下的流体溶液中，并且在77k时刚性基质）已被调查。对于一些化合物，还确定了X射线结构。新的双（吡啶基）三嗪掺入额外的发色团，例如联苯，菲，蒽和溴蒽衍生物，因此Ru-II物种可被认为是多摩洛芯片物种。已经将所有金属配合物的吸收光谱和氧化还原性分配给属于特定亚基的特征，因此表明这些物种可以被视为来自电子耦合的电子耦合点的多组分的超分子组件。而大多数复合物都表现出可归因于金属对配体电荷转移（MLCT）的发光性质，所述金属对配体电荷转移（MLCT）态涉及金属酶的亚基，含有Anthry1的物种，甚至更加溴化的花青发色团表现出复杂的发光行为。例如，2D（含白孔的异常金属化合物）在室温下表现出MLCT发射，并在77K处从蒽三态的发射;如图2E（含溴磺酸的含氧化硫基的异质金属化合物）在室温下在77k和MLCT发射时表现出基于Anthryl的发射，但延长了寿命，因此在两个属于不同发色团的两个三重态状态之间建议平衡。因此，通过合适的取代在有机发色团上达到MLCT和芳烃三联状态之间的平衡状态。

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