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Controlling the Direction of Photoinduced Energy Transfer in Multicomponent Species

机译：控制多组分物种中光诱导能量转移的方向

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摘要

Luminescence spectroscopy provides evidence for the efficient photoinduced energy transfer between the Ru~(II)-based metal-to-ligand chargetransfer (MLCT) chromophore and anthracene moieties in two multicomponent, rack-type species that contain Ru~(II)-polypyridine and anthracene subunits. Furthermore, the direction of such an energy transfer can be controlled: the energy-transfer process occurs from the Ru-based chromophore to the anthracene in a rigid matrix at 77 K, whilst in fluid solution at room temperature it occurs from the anthracene subunit to the Ru-based chromophore. The switch in the direction of the energy-transfer process arises from the quite different intrinsic lifetimes of the luminophores and the relatively small energy gap between the lowest energy excited states located in each subunit. The combination of such properties allows a thermal activation of an uphill energy transfer which switches the direction of the intercomponent process. This finding is of interest for the design, based on this relatively unexplored photophysical property, of novel artificial supramolecular systems that are capable of processing information at the molecular level .
机译：发光光谱学提供了在Ru-（II）-基金属-配体电荷转移（MLCT）生色团和蒽部分中的两个多组分Ru-（II）-多吡啶和蒽亚基。此外，可以控制这种能量转移的方向：能量转移过程是在77 K的刚性基质中从Ru基发色团发生到蒽的过程，而在室温下在流体溶液中发生的是从蒽亚基转移到蒽。钌基发色团。沿能量传递过程的方向转换是由于发光体的固有寿命完全不同以及位于每个子单元中最低能量激发态之间的相对较小的能隙。这些特性的组合允许热活化向上的能量传递，从而改变了组分间过程的方向。基于这种相对未开发的光物理性质，该发现对于设计能够在分子水平上处理信息的新型人工超分子系统是有意义的。

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