Herein is disclosed a bioinspired approach in which triggered conformational changes are used to control electron transfer (ET) events. Photo-induced conformational rearrangements of a ligand are translated into changes in the coordination geometry and environment about a bound metal ion. Taking advantage of the differential coordination properties of CuIand CuII, these dynamics facilitate intramolecular ET from CuIto the ligand to create a CS state. The synthesis and photophysical characterization of CuCl(dpaaR) (dpaa = dipicolylaminoacetophenone, with R = H and OMe) is presented. These ligands incorporate a fluorophore into their framework that gives rise to a twisted intramolecular charge transfer (TICT) excited state. Excited state ligand twisting provides a tetragonal coordination geometry capable of capturing CuIIin the CS state when an internalortho-OMe binding site is present (as in dpaaOMe).
本文公开了一种
生物启发方法,利用触发的构象变化来控制电子转移(ET)事件。
配体的光诱导构象重排被转化为结合
金属离子的配位几何和环境的变化。利用 CuI 和 CuII 的不同配位特性,这些动态变化促进了从 CuI 到
配体的分子内电子转移,从而形成 CS 状态。本文介绍了 CuCl(dpaaR)(dpaa = 二icolaminoacetophenone,R = H 和 OMe)的合成和光物理特性。这些
配体在其框架中加入了一种荧光体,从而产生了分子内电荷转移(TICT)扭曲激发态。激发态
配体扭转提供了一个四方配位几何结构,当存在一个内部正-OMe 结合位点(如 dpaaOMe)时,它能够捕获 CS 态的 CuII。