The chiral self-assembly of trispentahelicene propellers on a gold surface has been investigated in ultrahigh vacuum by means of scanning tunneling microscopy and time-of-flight secondary ion mass spectrometry. The trispentahelicene propellers aggregate into mirror domains with an enantiomeric ratio of 2 : 1. Thermally induced cyclodehydrogenation leads to planarization into nanographenes, which self-assemble into closed-packed layers with two different azimuths. Further treatment induces in part dimerization and trimerization by intermolecular cyclodehydrogenation.

Aix Marseille Univ CNRS Centrale Marseille iSm2 Marseille France

Aix Marseille Univ CNRS CINAM Marseille France

Department of Chemistry University of Zurich 8057 Zurich Switzerland

Nanosurf Laboratory Institute of Physics The Czech Academy of Sciences Cukrovarnická 10 16200 Prague Czech Republic

Surface Science and Coating Technologies Empa Swiss Federal Laboratories for Materials Science and Technology Überlandstrasse 129 8600 Dübendorf Switzerland

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