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Unraveling the Coulombic Forces in Electronically Decoupled Bichromophoric Systems during Two Successive Electron Transfers

机译:在两个连续的电子转移期间揭开电子分离的二色体系统中的库仑力

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摘要

Coulombic forces are vital in modulating the electron transfer dynamics in both synthetic and biological polychromophoric assemblies, yet quantitative studies of the impact of such forces are rare, as it is difficult to disentangle electrostatic forces from simple electronic coupling. To address this problem, the impact of Coulombic interactions in the successive removal of two electrons from a model set of spirobifluorenes, where the interchromophoric electronic coupling is nonexistent, is quantitatively assessed. By systematically varying the separation of the bifluorene moieties using model compounds, ion pairing, and solvation, these interactions, with energies up to about 0.4 V, are absent at distances greater than about 9 a. These findings can be (quantitatively) applied for the design of polychromophoric assemblies, whereby the redox properties of donors and/or acceptors can be tuned by judicious positioning of the charged groups to control the electron-transfer dynamics.
机译:Coulombic力对于调节合成和生物多彩盘组件中的电子转移动力学至关重要,但这种力的影响的数量研究是罕见的,因为难以解开来自简单电子耦合的静电力。 为了解决这个问题,可以评估来自模型组的模型组螺管螺螺母的模型组中的两个电子的影响。 通过系统地改变使用模型化合物,离子配对和溶剂化的分离,这些相互作用,其能量高达约0.4V,在大于约9a的距离处不存在。 这些发现可以(定量)应用于多彩芯片组件的设计,由此可以通过带电基团的明智定位来调节供体和/或受体的氧化还原性能以控制电子传递动态。

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