首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Rhenium(i) tricarbonyl polypyridine complexes showing strong absorption of visible light and long-lived triplet excited states as a triplet photosensitizer for triplet-triplet annihilation upconversion
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Rhenium(i) tricarbonyl polypyridine complexes showing strong absorption of visible light and long-lived triplet excited states as a triplet photosensitizer for triplet-triplet annihilation upconversion

机译:carbonyl(i)三羰基聚吡啶配合物,具有很强的可见光吸收能力和长寿命的三重态激发态,可作为三重态三重态an灭上转换的三重态光敏剂

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The preparation of rhenium(i) tricarbonyl polypyridine complexes that show a strong absorption of visible light and long-lived triplet excited state and the application of these complexes as triplet photosensitizers for triplet-triplet annihilation (TTA) based upconversion are reported. Imidazole-fused phenanthroline was used as the N^N coordination ligand, on which different aryl groups were attached (Phenyl, Re-0; Coumarin, Re-1 and naphthyl, Re-2). Re-1 shows strong absorption of visible light (ε = 60800 M ~(-1) cm ~(-1) at 473 nm). Both Re-1 and Re-2 show long-lived T _1 states (lifetime, τ _T, is up to 86.0 μs and 64.0 μs, respectively). These properties are in contrast to the weak absorption of visible light and short-lived triplet excited states of the normal rhenium(i) tricarbonyl polypyridine complexes, such as Re-0 (ε = 5100 M ~(-1) cm ~(-1) at 439 nm, τ _T = 2.2 μs). The photophysical properties of the complexes were fully studied with steady state and time-resolved absorption and emission spectroscopes, as well as DFT calculations. The intra-ligand triplet excited state is proposed to be responsible for the exceptionally long-lived T _1 states of Re-1 and Re-2. The Re(i) complexes were used as triplet photosensitizers for TTA based upconversion and an upconversion quantum yield up to 17.0% was observed.
机译:据报道,i(i)三羰基聚吡啶配合物的制备显示出对可见光的强烈吸收和长寿命的三线态激发态,并已将这些配合物用作三线态三重态an灭(TTA)上转换的三线态光敏剂。咪唑稠合的菲咯啉用作N ^ N配位配体,在其上连接了不同的芳基(苯基,Re-0;香豆素,Re-1和萘基,Re-2)。 Re-1显示出对可见光的强烈吸收(在473 nm处ε= 60800 M〜(-1)cm〜(-1))。 Re-1和Re-2都显示长寿命的T _1状态(寿命τ_T分别高达86.0μs和64.0μs)。这些性质与正常Re(i)三羰基聚吡啶配合物(例如Re-0(ε= 5100 M〜(-1)cm〜(-1))的可见光吸收弱和短寿命的三重态激发态相反)在439 nm处,τT = 2.2μs)。使用稳态和时间分辨吸收和发射光谱仪以及DFT计算对配合物的光物理性质进行了全面研究。提出了配体内三重态激发态负责Re-1和Re-2的超长寿命T _1状态。 Re(i)络合物用作基于TTA的上转换的三重态光敏剂,并且观察到高达17.0%的上转换量子产率。

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