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Light-Driven Charge Separation in Isoxazolidine-Perylene Bisimide Dyads

机译:异恶唑烷-Per双酰亚胺二元化合物中的光驱电荷分离

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摘要

A series of arrays for light-driven charge separation is presented, in which perylene tetracarboxylic bisimide is the light-absorbing chromophore and electron acceptor, whereas isoxazolidines are colourless electron donors, the electron-releasing properties of which are increased with respect to the amino group by means of the alpha-effect. Charge separation (CS) in toluene over a distance ranging from approximate to 10 to approximate to 16 angstrom, with efficiencies of approximate to 95 to approximate to 50% and CS lifetimes from 300 ps to 15 ns, are demonstrated. In dichloromethane the charge recombination reaction is faster than charge separation, preventing accumulation of the CS state. The effects of solvent polarity and molecular structure are discussed in the frame of current theories.
机译:提出了一系列用于光驱动电荷分离的阵列,其中per四羧酸双酰亚胺是吸光的生色团和电子受体,而异恶唑烷是无色的电子给体,其电子释放性能相对于氨基有所提高通过阿尔法效应。证明了在甲苯中的电荷分离(CS)范围大约为10到大约16埃,效率大约为95到大约50%,CS寿命为300 ps到15 ns。在二氯甲烷中,电荷重组反应比电荷分离更快,从而阻止了CS态的积累。在当前理论的框架内讨论了溶剂极性和分子结构的影响。

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