Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 83: Organic Molecules on Inorganic Substrates VI: Chirality, Charge Transfer, Self-Assembly

O 83.1: Vortrag

Donnerstag, 4. April 2019, 15:00–15:15, H9

Supra-molecular spirals formed by self-assembly of spiral shaped molecules — •Jan Voigt¹, Milos Baljozovic¹, Kévin Martin², Narcis Avarvari², Karl-Heinz Ernst¹, and Christian Wäckerlin¹ — ¹Empa, Dübendorf, Switzerland — ²Université d'Angers, France

The interdependence of macroscopic and molecular chirality, which is ubiquitous in nature, is still lacking scientific insight. Here, the 2D crystallization of benzene-1,3,5-tris[4]helicene on the Ag(111) surface is studied with scanning tunneling microscopy. The molecules consist of three [4]helicene subunits, which are intrinsically chiral, attached to a central benzene ring via sigma bonds. The helical arms have a low barrier of inversion and the sigma bonds allow for additional configurational flexibility. Indeed, deposition on the sample kept at room temperature leads to self-assembled, homochiral arrays of spiral shaped trishelicenes. Above a critical coverage, mesoscopic supramo-lecular spirals are formed. These supramolecular arrangements occur with different topology and their handedness is determined by the chirality of the molecular spirals in the self-assembled domain.