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Unbalanced 2D Chiral Crystallization of Pentahelicene Propellers and Their Planarization into Nanographenes
Author(s) -
Voigt Jan,
Roy Myriam,
Baljozović Miloš,
Wäckerlin Christian,
Coquerel Yoann,
Gingras Marc,
Ernst KarlHeinz
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202101223
Subject(s) - chemical mechanical planarization , crystallization , scanning tunneling microscope , materials science , enantiomer , ion , chemical engineering , crystallography , layer (electronics) , nanotechnology , chemistry , stereochemistry , organic chemistry , engineering
Abstract 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.