Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 98: Organic-Inorganic Systems V: Adsorption on Metals

O 98.9: Talk

Friday, March 11, 2016, 12:30–12:45, H24

A comparative STM study: adsorption behavior of different benzoporphyrin derivatives on coinage metals — Michael Lepper, Michael Stark, Liang Zhang, Hans-Peter Steinrück, and •Hubertus Marbach — Lehrstuhl für Physikalische Chemie II and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058

A detailed comparative scanning tunneling microscopy (STM) study of the self-assembly of different benzoporphyrin derivatives, among these Ni(II)-5,10,15,20-tetraphenyltetrabenzoporphyrin (NiTPBP) [1], the corresponding free-base analogue 2HTPBP and of Ni(II)-meso-tetrakis (4-tert-butylphenyl) benzoporphyrin (NiTTBPBP) [2], i.e., with additional tert-butyl groups at the para positions of the phenyl substituents on different substrates, namely Ag(111), Cu(111), Cu(110) and Cu(110)-(2x1)O will be presented and discussed. Depending on the actual molecule-substrate combination, the coverage and the sample temperature different adsorption behaviors are observed ranging from polymorphism [1], monomodal supramolecular arrangements [2] to the formation of molecular chains. The results will be interpreted based on the specific molecule-substrate and molecules-molecules interactions [1]. A particular focus will thereby be on the benzo groups which effectively establish a steric hindrance within the porphyrin macrocycle.

[1] M. Lepper et al., J.Phys. Chem. C, 119 (2015) 19897

[2]L. Zhang et al., PCCP, 17 (2015) 13066