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O: Fachverband Oberflächenphysik

O 42: Organic/bio Molecules on Metal Surfaces IV

O 42.6: Talk

Wednesday, March 13, 2013, 11:45–12:00, H38

Diethylstilbestrol on Ag(111) and Cu(111): an STM study — •Seung Cheol Oh, Julian A. Lloyd, Sybille Fischer, Özge Altuntasoglu Saglam, Anthoula C. Papageorgiou, Joachim Reichert, and Johannes V. Barth — Physik Department E20, Technische Universität München, 85748 Garching, Germany

Diethylstilbestrol (DES) is a synthetic estrogen, which has been banned after its association with adverse health effects. It contains two phenol groups, which can be coplanar, thus allowing the molecule to act as ditopic surface molecular linker. Our study was motivated by the fact that phenol groups can be used to control of molecular self-assembly [1]. Here we focus on investigating the self-assembly of DES on two single crystal metal surfaces by means of variable-temperature scanning tunneling microscopy (STM). We find a variety of different two-dimensional molecular networks depending on the supporting metal (silver and copper) and on the annealing temperature. Based on the known interactions of phenols on surfaces as well as a carefull analysis of STM topographic images we present tentative strucural models for the observed self-assembled nanosctructures.

[1] Pawlak, R. et al. ChemPhysChem 2009, 10, 1032–1035.