Complexes with switchable luminescence: Correlation between spin state, packing and emission properties

本项目的目的是合成和表征自旋态可以改变的铁(II)和镍(II)配合物，并在配体主链上具有发光单元。为了实现这种分子功能化化合物的可靠途径，我们将研究成功耦合自旋态和发射性质的潜在机制。一方面，配体将被修饰以控制在溶液(单核配合物)和固体(通过配位聚合物的桥联配体或作为聚集的单体)中的聚集，以研究聚集对发射性能的影响。同时，电子性质(金属中心及其自旋态，配体上的取代基，HOMO/LUMO/SOMO的相对位置)将被改变，以更好地了解配合物的分子内性质。其目的是实现一种在发光和自旋态之间提供协同效应的配体环境。此外，分子间相互作用将被用来获得控制发射性质的第二种可能性。

The aim of this project is the synthesis and characterization of iron(II) and nickel(II) complexes where the spin state can be changed and with luminescent units in the ligand backbone. The underlying mechanism for a successful coupling of spin state and emission properties will be investigated to realize a reliable access to such molecular functionalized compounds. On the one hand, the ligands will be modified to control aggregation in solution (mononuclear complexes) and in the solid (via bridging ligands for coordination polymers or as aggregated monomers) to investigate the impact of aggregation on the emission properties. In parallel, the electronic properties will be modified (metal centre and its spin state, substituents at the ligand, relative position of HOMO/LUMO/SOMO) to better understand the intramolecular properties of the complexes. The aim is to realize a ligand environment that provides synergetic effects between luminescence and spin state. Furthermore, the intermolecular interactions will be used to obtain a second possibility to control the emission properties.