金属有机单层（MOL）上量子相干能量转移

光合作用中吸光网络“量子相干”的超快能量转移扮演重要角色。不同于经典的能量转移，“飞秒-皮秒”时间尺度的能量转移可发生在激发态“退相干”之前，其定向转移规律与量子态的“定域化”密切相关。染料分子通过蛋白骨架的结构互锁是生物体系获得较长“相干时间”，从而协助超快能量转移的关键因素之一。二维金属有机单层化合物（MOL）是由有机配体和金属离子通过配位键交替连接的二维网络结构，其中有机配体位置固定、结构清晰，其分子间电子耦合强度与光合作用系统类似。本项目拟利用MOL构建人工光合网络，通过飞秒瞬态吸收光谱、二维光谱和飞秒瞬态圆二色光谱，结合材料的设计和可控化学修饰，研究网络中分子通过金属离子互锁对“量子相干”的影响，延长相干时间，探究“量子相干”能量转移的定量规律，实现定向能量传输，为设计高效人工光能转换体系提供新原理和新方法。

Ultrafast "quantum coherent" energy transfer plays an important role in light harvesting during photosynthesis. Unlike classical energy transfer, the energy transfer at the "femtosecond-picosecond" time scale can occur before the "dephasing" of the excited state. Rules governing these ultrafast energy transfer is closely related to the "localization" of the quantum state. The structural interlocking of dye molecules by the protein backbone is one of the key factors in the biological system to obtain longer "coherence time" to assist the ultrafast energy transfer. Metal organic layer (MOL) is a two-dimensional network structure in which organic ligands and metal ions are alternately connected through coordination bonds. The organic ligands have a fixed position and a clear structure, and the intermolecular electron coupling strength is similar to that in photosynthesis system. The project intends to use MOL to construct an artificial photosynthetic network. Based on the design of materials and controllable chemical modification, the project uses the femtosecond transient absorption spectra, two-dimensional spectra and the femtosecond transient circular dichroism spectra to study the influence of molecules on the "quantum coherent" through metal ion interlocking and strategies to extend the coherence time. We also aim to explore the quantitative law of "quantum coherent" energy transfer to achieve directional energy transmission, in hope to provide new principles and new methods for designing highly efficient artificial light energy conversion system.