Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Organic-Inorganic Systems III: Metal-Organics
O 58.6: Vortrag
Mittwoch, 9. März 2016, 16:30–16:45, S054
Tetrapyrrole metalation with rare earths — •Katharina Diller1, Aparajita Singha1, Christian Wäckerlin1, Jan Dreiser2, Alberto Verdini3, Albano Cossaro3, Luca Floreano3, and Harald Brune1 — 1École Polytechnique Fédérale de Lausanne, Switzerland — 2Paul Scherrer Institute, Switzerland — 3CNR-IOM, Laboratorio Nazionale TASC, I-34149 Trieste, Italy
The in vacuo metalation of tetrapyrrole molecules is a convenient way to build tetrapyrrole-based metal-organic structures on metal surfaces. A commonly employed route is the deposition of molecules by organic molecular beam epitaxy, which subsequently are exposed to a beam of metal atoms. Given the importance of terbium phthalocyanine double decker compounds as single molecule magnets, it is surprising that so far on-surface metalation predominantly focused on the creation of transition metal complexes, with only few scanning tunneling microscopy (STM) studies dedicated to the rare earth Ce [1, 2]. Here, we follow the metalation of free-base tetraphenylporphyrin and free-base phthalocyanine molecules on Ag(111) with different rare earth metals using a combination of scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and near-edge X-ray absorption fine-structure (NEXAFS) spectroscopy. We show that metalation can be readily achieved at room temperature, and discuss the effects of an excess of metal atoms on the spectroscopic signatures.
[1] D. Écija et al., Angew. Chem. Int. Ed., 2011, 50, 3872, [2] A. Weber-Bargioni et al., J. Phys. Chem. C, 2008, 112, 3453.