Dissertation

|4 Summary|
additional NN- and NHC-coordination sphere was obtained, opening up the access toward
multimetallic catalyst centers and extended light harvesting systems.
The x-structural analysis of edip exhibits a pre-organized NHC-NHC chelating sphere which
is suitable for multimetallic metal fragments with a diameter of roughly 0.6 nm. From the
ligands, the N,N’-coordinated {Ru(tbbpy) 2 } 2+ -type complexes Ru(eip), and Ru 2 (edip) could
be prepared and characterized, including X-ray analysis of Ru(eip). In a final exploratory
study the tetranuclear compound Ru 2 (edip)Ag 2 , containing the silver NHC moiety was
prepared and characterized by different NMR and MS analysis.
In general, the prepared phenanthroline and imidazophenanthroline ligands such as phenphen,
bbip or edip were found to be suitable starting materials for the further incorporation
into intramolecular photocatalytic systems. Especially the combination of azadiene and NHC
coordination spheres was found to be ideal for the design of stable molecular P ∼ B ∼ C-type
devices in which the catalytic center as well as the photocenter may be widely varied in terms of
metal fragment and co-ligand environment to even allow a change in the nature of the catalytic
reaction, which is driven by light.
There is to hope that these achieved results will pave the way for further research and development
and thus that possibly a contribution was made to the answer the energy problem of the future.
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