Title：	Surface science meets coordination chemistry: Metal complexes at interfaces
Speaker：	Prof. Dr. J. Michael Gottfried (University Marburg, Department of Chemistry, Surface Physical Chemistry, Germany )
Time：	2012-03-30　 15:30
Location：	3#210

 

 

 

 

 

 

 

A promising approach for the functionalization of surfaces and interfaces for catalytic and sensor applications is the self-assembly of active metal complexes. Complexes with coordinatively unsaturated metal centers which form direct bonds to the underlying surface are particularly interesting, because this interaction can be used to control the electronic structure and thus the reactivity of the metal centers. Interfacial coordinative bonds also play a role in photovoltaics and organic electronics, where metal complexes are used as organic semiconductors or photosensitizers.This lecture gives an overview of recent advances in surface coordination chemistry of porphyrins and phthalocyanines, ligands which provide a square-planar environment for undercoordinated metal centers with vacant axial coordination sites. This makes them suitable model systems for studying (i) interactions of coordinated metal ions with surfaces and (ii) the coordination of axial ligands to the adsorbed complexes. It will be demonstrated how these complexes can be synthesized directly on the surface from co-adsorbed ligand molecules and metal atoms. With bifunctional ligands, which can coordinate metal atoms both in the center and at the periphery, 2D metal-organic coordination networks with metal atoms in different oxidation states can be obtained. Besides these examples of surface-confined synthesis and structure, the nature of the surface coordinative bond will be discussed and novel concepts such as the surface trans effect, which combines principles of surface science and coordination chemistry, will be introduced.