Details

Autor(en) / Beteiligte

• Irziqat, Bahaaeddin
• Berger, Jan
• Mendieta‐Moreno, Jesús I.
• Sundar, Mothuku Shyam
• Bedekar, Ashutosh V.
• Ernst, Karl‐Heinz

Titel

Transition from Homochiral Clusters to Racemate Monolayers during 2D Crystallization of Trioxa[11]helicene on Ag(100)

Ist Teil von

• Chemphyschem, 2021-02, Vol.22 (3), p.293-297

Ort / Verlag

Germany

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• The phenomenon of chiral crystallization into homochiral crystals is known for more than 170 years, yet it is still poorly understood. Studying crystallization on surfaces under well‐defined condition seems a promising approach towards better understanding the intermolecular chiral recognition mechanisms during nucleation and growth. The two‐dimensional aggregation of racemic trioxaundecahelicene on the single crystalline silver(100) surface has been investigated with scanning tunneling microscopy and with non‐contact atomic force microscopy, as well as molecular modeling simulations. A transition from homochiral cluster motifs to heterochiral assembly into large islands with increasing coverage is observed. Force field modelling confirms higher stability of heterochiral arrangements from twelve molecules on. Results are discussed with respect to previous findings for the all‐carbon heptahelicene on the same surface. Feeling the twist: Using a carbon‐monoxide‐modified tip of an atomic force microscope, the absolute handedness of trioxa[11]helicene molecules on a silver surface is determined. This allows discriminating cases of heterochiral and homochiral two‐dimensional aggregation and reveals a transition from homochiral octamers to close‐packed racemate monolayers with increasing coverage.