New luminescent lanthanoid architectures

In the course of this work, new luminescent lanthanoid architectures were prepared and photophysically characterised. A main focus was the ligand design and the realisation of an extended, carboline-based cryptate, which allows europium luminescence upon excitation with visible light for future biological applications. Furthermore, a more flexible cryptate was developed and by variation of the cavity of the lanthanoid complex, their symmetry was analysed regarding the antenna properties. For the investigation of circularly polarised luminescence (CPL), the chiral resolution of a variety of lanthanoid cryptates by chiral HPLC was successfully applied and the configurational stability of the enantiomers was experimentally confirmed. In addition, the new carboline-based cryptates facilitate the excitation of europium CPL with visible light. As an alternative to lanthanoid-based CPL emitters, a chromium(III) complex was chirally resolved and experimentally studied. A remarkable CPL activity was observed for such transition metal complexes. Further studies on three dimensional coordination networks, based on 2,2'-bipyridine, facilitated the investigation of energy transfer processes between different lanthanoids in a rigid ligand environment.