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O: Fachverband Oberflächenphysik

O 19: Poster Monday: Organic Molecules on Inorganic Surfaces

O 19.9: Poster

Montag, 1. April 2019, 17:45–20:00, Poster F

On-Surface Synthesis and Characterization of Lanthanide and Actinide Tetrapyrrole Complexes — •Erik Rheinfrank, Mathias Pörtner, Carmen N. Beyerle, Peter Feulner, Peter S. Deimel, Felix Haas, Francesco Allegretti, Johannes V. Barth, and Willi Auwärter — Technical University of Munich, Germany

Metal-organic complexes and coordination architectures on metal surfaces have attracted considerable interest. Specifically, lanthanide-based structures provide distinct structural, electronic, and magnetic properties [1], whereas actinides are rarely explored to date. Lanthanides and actinides can be sandwiched between macrocyclic ligands, resulting in 3D complexes, such as tetrapyrrole double- and multideckers [1]. Here, we report on the in-situ synthesis of Th-TPP complexes on a Ag(111) surface under ultra-high vacuum conditions by exposing a tetraphenylporphyrin (TPP) multilayer to an atomic beam of Th followed by a temperature-programmed reaction and desorption of surplus material. The nature of the interaction between Th and the TPP molecules, as well as the electronic properties of this metal-organic compound were investigated using X-ray photoelectron spectroscopy (XPS), scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). The findings will be discussed in relation to Ce-based complexes, such as Ce-phthalocyanine sandwich compounds.

[1] D. Ecija et al., Acc. Chem. Res. 51, 365 (2018)