Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 22: Organic-Inorganic Hybrid Systems and Organic Films

O 22.7: Poster

Montag, 7. März 2016, 18:15–20:30, Poster E

Temperature Dependent Structure Formation of Phthalic Acid on Cu (111) — •Feifei Xiang, Tobias Schmitt, Anastasia Sokolova, and M. Alexander Schneider — Solid State Physics, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany

Carboxylic acids are popular building blocks in molecular self-assembly and many examples show that deprotonation at surfaces changes the obtained structures. Here we investigate an example where surface-induced anhydride and poly-anhydride formation were found previously on a Ag(100) surface [1]. We studied the self-assembly of phthalic acid (1,2-Benzenedicaboxylic Acid) by low-temperature scanning tunneling microscopy on Cu(111) surface as function of the substrate temperature. At room temperature and above phthalic acid forms phthalic anhydride on Cu(111). However, contrary to the situation on Ag(100) [1], we find that monomers of phthalic anhydride are present on Cu(111) and form linear ribbon structures at room temperature. Our experiments also indicate that multilayer molecular packing is still stable at 423K. The extraordinarily ordered structures found finally decompose above 473K.

[1] M. Franke, et al. J. Phys. Chem. C, 2015, 119, 23580*23585