Surface-Grafted Multiporphyrin Arrays as Light-Harvesting Antennae to Amplify Photocurrent Generation
作者:Mitsuhiko Morisue、Shigeru Yamatsu、Noriko Haruta、Yoshiaki Kobuke
DOI:10.1002/chem.200500040
日期:2005.9.19
coordination/metathesis reactions allow the stepwise accumulation of multiporphyrin arrays on the gold electrode. A successive increase in absorption over a wide wavelength range occurred after each accumulation step of Zn2(ImP)2 on the gold electrode, and cathodic photocurrent generation was enhanced in the aqueous electrolyte system, containing viologen as an electron carrier. The significant increase of the photocurrent
通过一种新型的配位导向分子结构,在导电表面上开发了有序的多卟啉阵列,旨在实现高效的光电转换。基本策略是利用两个咪唑基卟啉酮锌(II)单元的相互配合形成界面二聚体。因此,内消旋,内消旋连接的双(咪唑基卟啉酮锌)(Zn2(ImP)2)被组织到金基板上的咪唑基卟啉酮锌上,成为自组装单层膜。通过Grubbs催化剂催化的闭环烯烃复分解,将带有烯丙基侧链的有组织的Zn2(ImP)2共价连接。交替的配位/复分解反应允许多卟啉阵列在金电极上逐步积累。Zn2(ImP)2在金电极上的每个积累步骤之后,在宽波长范围内吸收都发生了连续增加,并且在以紫罗兰为电子载体的水性电解质体系中,阴极光电流的产生得到了增强。光电流的显着增加表明多卟啉阵列在金电极上充当“光收集天线”。