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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Excitation-dependent fluorescence of triphenylamine-substituted tridentate pyridyl ruthenium complexes
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Excitation-dependent fluorescence of triphenylamine-substituted tridentate pyridyl ruthenium complexes

机译：三苯胺取代的三齿吡啶吡啶钌络合物的激发依赖性荧光

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摘要

Two polypyridyl ruthenium complexes, bis[4-(N,N′-diphenylamino) phenyl-2,2′:6′,2′′-terpyridine]ruthenium(II) (1) and bis[4′-(4-{2-[4-(N,N′-diphenylamino)phenyl]ethylene}phenyl)-2, 2′:6′,2′′-terpyridine]ruthenium(II) (2), have been synthesized. They possess an extended conjugation and strongly coupled electronic states. The features of these compounds were carefully studied from several respects. Steady-state spectroscopy showed that the two compounds had strong excitation dependent emission behaviors caused by mixing features of different electronic states. Femtosecond fluorescence upconversion spectroscopy was also used to investigate the fluorescence dynamics of the compounds. An ultrafast relaxation time of ～100 fs of the 1MLCT (metal-to-ligand charge-transfer) states, which may originate from an ultrafast intersystem crossing to form 3MLCT states, was found in both samples. However, thermal populated states and vibration associated excited state interactions were suggested for 1 with excitation at wavelengths below 400 nm, whereas vibrational energy redistribution with a time scale of few picoseconds was observed in the extended conjugated system of 2. These compounds will have potential application in both artificial photosynthesis systems and photovoltaic devices.
机译：两种多吡啶基钌络合物，双[4-（N，N'-二苯基氨基）苯基-2,2'：6'，2''-吡啶吡啶]钌（II）（1）和双[4'-（4- {已经合成了2- [4-（N，N'-二苯基氨基）苯基]乙烯}苯基）-2，2'：6'，2''-叔吡啶]钌（II）（2）。它们具有扩展的共轭和强耦合的电子状态。从多个方面仔细研究了这些化合物的特征。稳态光谱表明，由于不同电子态的混合特征，这两种化合物具有强的激发依赖性发射行为。飞秒荧光上转换光谱法也用于研究化合物的荧光动力学。在两个样品中都发现了1MLCT（金属到配体电荷转移）状态的〜100 fs的超快弛豫时间，这可能是由于超快系统间交叉形成3MLCT态所致。然而，对于波长低于400 nm的激发，建议对1进行热填充态和与振动相关的激发态相互作用，而在2的扩展共轭体系中观察到振动能量以几皮秒的时间尺度重新分布。这些化合物将具有潜在的应用前景。在人工光合作用系统和光伏设备中都有应用。

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