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首页> 外文期刊>Chemistry: A European journal >Electronic Energy Transfer to the S-2 Level of the Acceptor in Functionalised Boron Dipyrromethene Dyes
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Electronic Energy Transfer to the S-2 Level of the Acceptor in Functionalised Boron Dipyrromethene Dyes

机译：电子能量转移到功能化硼二吡咯亚甲基染料中受体的S-2能级上

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摘要

A multi-component array has been constructed around an expanded boron dipyrromethene (Bodipy) dye that absorbs and emits in the far-red region. One of the appendages is a perylene-based moiety that is connected to the boron atom of the terminal Bodipy by a 1,4-diethynylphenylene connector. Despite the fact that there is almost negligible spectral overlap between fluorescence from the perylene unit and absorption by the Bodipy residue, electronic energy transfer is rapid and essentially quantitative. It is concluded that at least half of the photons absorbed by perylene are transferred to the upper-lying singlet excited state (S-2) associated with the Bodipy-based acceptor. The second appendage is a pyrene unit that is covalently linked to fluorene, through an ethynylene spacer, and to the boron atom of the Bodipy terminus, through a 1,4-diethynylphenylene connector. Pyrene absorbs and emits at higher energy than perylene and there is strong spectral overlap with the Bodipy-based S-2 state, and none with the corresponding S-1 state. Electronic energy transfer is now very fast and exclusively to the S-2 state of the acceptor. It is difficult to compute reasonable estimates for the rates of Coulombic energy transfer, because of uncertainties in the orientation factor, but the principle mechanism is believed to arise from electron exchange. Comparison with an earlier array built around a conventional Bodipy dye indicates that there are comparable electronic coupling matrix elements for the two systems. It is notable that pyrene is more strongly coupled to the Bodipy unit than perylene in both arrays. These new arrays function as highly effective solar concentrators.
机译：围绕膨胀的硼二吡咯亚甲基（Bodipy）染料构建了一个多组件阵列，该染料在远红色区域吸收和发射。附属物之一是基于per的部分，其通过1，4-二乙炔基亚苯基连接器连接至末端Bodipy的硼原子。尽管来自per单元的荧光与Bodipy残基的吸收之间几乎没有光谱重叠的事实，但电子能量的转移是快速的，并且基本上是定量的。结论是，per吸收的光子中至少有一半转移到与基于Bodipy的受体相关的单线激发态（S-2）。第二附属物是a单元，其通过亚乙炔间隔基与芴共价连接，并通过1，4-二乙炔基亚苯基连接体与Bodipy末端的硼原子共价连接。吸收和发射的能量要比per高，并且与基于Bodipy的S-2状态存在很强的光谱重叠，而与相应的S-1状态则没有光谱重叠。现在，电子能量转移非常快，并且仅转移到受体的S-2状态。由于取向因子的不确定性，很难计算出库仑能量转移速率的合理估计值，但是据信其主要机理是由电子交换引起的。与围绕传统Bodipy染料构建的较早阵列的比较表明，这两个系统具有可比较的电子耦合矩阵元素。值得注意的是，在两个阵列中，than均比per更牢固地耦合至Bodipy单元。这些新阵列可作为高效的太阳能集中器。

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