Ultrafast Photoinduced Energy and Electron Transfer in Multi-Modular Donor-Acceptor Conjugates
作者:Mohamed E. El-Khouly、Channa A. Wijesinghe、Vladimir N. Nesterov、Melvin E. Zandler、Shunichi Fukuzumi、Francis D'Souza
DOI:10.1002/chem.201202265
日期:2012.10.22
Introducing either fullerene or naphthalenediimide electron acceptors to the TPA‐BDP‐ZnP triad through metal–ligand axial coordination resulted in electron donor–acceptor polyads whose structures were revealed by spectroscopic, electrochemical and computational studies. Excitation of the electron donor, zinc porphyrin resulted in rapid electron‐transfer to coordinated fullerene or naphthalenediimide yielding
新设计并合成了具有卟啉锌(ZnP),邻苯二酚螯合的硼二吡啶(BDP),三苯胺(TPA)和富勒烯(C 60)或萘二酰亚胺(NDI)的新型多模块供体-受体共轭物,作为光合天线和反应中心模拟物。还报告了三苯胺BDP的X射线结构。宽带捕获多联体显示出超快的能量传递(k ENT = 1.0×10 12 s -1)由于实体的紧密接近和有利的取向而从单重激发的BDP到共价连接的ZnP。通过金属-配体轴向配位将富勒烯或萘二酰亚胺电子受体引入TPA-BDP-ZnP三单元,从而形成电子供体-受体多单元,其结构通过光谱,电化学和计算研究得以揭示。激发电子供体锌卟啉导致快速的电子转移到配位的富勒烯或萘二酰亚胺,产生电荷分离的离子对物质。飞秒瞬态光谱技术在非极性甲苯中测得的电子传输速率常数为5.0×10 9 –3.5×10 10 s -1。在这些多模块供体-受体多聚体中,电荷分离态的稳定也被观察到一定水平。