Interaction of cerium atoms with surface-anchored porphyrin molecules

A. Weber-Bargioni, J. Reichert, A. P. Seitsonen, W. Auwärter, A. Schiffrin, J. V. Barth

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By exposing tetraphenyl-porphyrin (H2-TPP) molecules anchored on a Ag(111) surface to a beam of cerium atoms under vacuum conditions, a selective interaction of the lanthanide with the porphyrin macrocycle is achieved. A novel Ce-TPP species is formed that can be clearly identified in scanning tunneling microscopy data resolving intramolecular features. The electronic structure of the Ce-TPP was characterized by scanning tunneling spectroscopy, identifying molecular resonances that are related to those of coadsorbed Co-TPP. The inhomogenous local electronic density distribution of the dominating Ce-TPP and Co-TPP occupied states was visualized by tunneling spectroscopy mapping. With complementary density functional theory calculations, the geometry and energetics of the Ce-porphyrin bonding was determined.

Original languageEnglish
Pages (from-to)3453-3455
Number of pages3
JournalJournal of Physical Chemistry C
Issue number10
StatePublished - 13 Mar 2008


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