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首页> 外文期刊>Chemistry: A European journal >DNA-Based Oligochromophores as Light-Harvesting Systems
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DNA-Based Oligochromophores as Light-Harvesting Systems

机译：基于DNA的寡色团作为光收集系统

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摘要

The chromophores ethynyl pyrene as blue, ethynyl perylene as green and ethynyl Nile red as red emitter were conjugated to the 5-position of 2-deoxyuridine via an acetylene bridge. Using phosphoramidite chemistry on solid phase labelled DNA duplexes were prepared that bear single chromophore modifications, and binary and ternary combinations of these chromophore modifications. The steady-state and time-resolved fluorescence spectra of all three chromophores were studied in these modified DNA duplexes. An energy-transfer cascade occurs from ethynyl pyrene over ethynyl perylene to ethynyl Nile red and subsequently an electron-transfer cascade in the opposite direction (from ethynyl Nile red to ethynyl perylene or ethynyl pyrene, but not from ethynyl perylene to ethynyl pyrene). The electron-transfer processes finally provide charge separation. The efficiencies by these energy and electron-transfer processes can be tuned by the distances between the chromophores and the sequences. Most importantly, excitation at any wavelength between 350 and 700nm finally leads to charge separated states which make these DNA samples promising candidates for light-harvesting systems.
机译：发色团乙炔基pyr为蓝色，乙炔基per为绿色，乙炔基尼罗河红为红色发射体，经乙炔桥与2-脱氧尿苷的5-位共轭。使用亚磷酰胺化学方法，在固相标记的DNA双链体上制备了具有单个生色团修饰以及这些生色团修饰的二元和三元组合。在这些修饰的DNA双链体中研究了所有三个生色团的稳态和时间分辨荧光光谱。乙炔pyr上的乙炔基to到乙炔基尼罗红发生能量转移级联，随后以相反的方向发生电子转移级联（乙炔基尼罗红到乙炔基per或乙炔基pyr，而不是乙炔per到乙炔基pyr）。电子转移过程最终提供了电荷分离。这些能量和电子转移过程的效率可以通过发色团与序列之间的距离来调节。最重要的是，在350至700nm之间的任何波长激发最终会导致电荷分离，这使这些DNA样品有望成为光收集系统的候选者。

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