Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 34: Nanostructures at Surfaces II
O 34.5: Talk
Tuesday, March 8, 2016, 11:30–11:45, H6
Interplay of chemical and electronic structure on the single-molecule level in 2D polymerization — •Claudius Morchutt1,3, Jonas Björk2, Carola Strasser3, Ulrich Starke3, Rico Gutzler3, and Klaus Kern1,3 — 1Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany — 2Department of Physics, Chemistry and Biology, IFM, Linköping University, 58183 Linköping, Sweden — 3Institut de Physique de la Matière Condensée, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
Single-layers of covalently-linked organic materials in the form of two-dimensional (2D) polymers constitute structures complementary to inorganic 2D materials. The electronic properties of the 2D polymer can be manipulated through a deliberate choice of precursor organic molecules. In this work, the changes in electronic structure from precursor molecule to oligomer are addressed by scanning tunneling spectroscopy and ultra violet photoelectron spectroscopy. The polymerization reaction of 1,3,5-tris(4-carboxyphenyl)benzene via reductive decarboxylation on Cu(111) is investigated by scanning tunneling microscopy, x-ray photoelectron spectroscopy and density functional theory calculations. We present a comprehensive study of an on-surface coupling reaction without contaminating side-products and we show HOMO/LUMO shifts as a consequence of decarboxylation and polymerization on the molecular level.