Photodriven transmembrane charge separation and electron transfer by a carotenoporphyrin–quinone triad
Photodriven transmembrane charge separation and electron transfer by a carotenoporphyrin–quinone triad
复制标题
胡萝卜卟啉-醌三联体的光驱动跨膜电荷分离和电子转移
作者：
P. Seta;E. Bienvenue;A. Moore;P. Mathis;R. Bensasson;P. Liddell;P. J. Pessiki;A. Joy;T. Moore;D. Gust
光化学跨膜电子转移过程是自然光合作用太阳能转换的一个组成部分，也是仿生能量转换方案设计的核心1 - 6。本文报道了胡萝卜素卟啉-醌三元组（I）的合成及其膜相关光电化学性质，并且具有跨越磷脂双层所必需的分子结构。在通过可见光激发化合物1时，电荷在分子内步骤中跨平面磷脂双层膜（BLM）分离;在水相中存在合适的电子供体和受体物质的情况下，在桥接BLM的外部电路中观察到稳态光电流。因此，含有I的人工膜模仿光合生物的光驱动跨膜电子转移过程的关键特征。
Photochemical transmembrane electron transfer processes are an integral part of natural photosynthetic solar energy conversion and are also central to the design of biomimetic energy conversion schemes1–6.Here we report the synthesis and membrane-associated photoelectrochemical properties of carotenoporphyrin–quinone triad (I), a compound containing a photochemically active porphyrin and electron donor and acceptor moieties, and with the molecular architecture necessary to span a phospholipid bilayer. On excitation of compound 1 by visible light, charge is separated across a planar phospholipid bilayer membrane (BLM) in an intramolecular step; in the presence of suitable electron donor and acceptor species in the aqueous phases, a steady-state photo-current is observed in an external circuit bridging the BLM. Artificial membranes containing I thus mimic key features of the photodriven transmembrane electron transfer processes characteristic of photosynthetic organisms.