Transition from homochiral clusters to racemate monolayers during 2D crystallization of trioxa[11]helicene on Ag(100)

0549994 - FZÚ 2022 RIV DE eng J - Journal Article
Irziqat, B. - Berger, Jan - Mendieta Moreno, Jesús Ignacio - Shyam Sundar, Mothuku - Bedekar, A. V. - Ernst, Karl-Heinz
Transition from homochiral clusters to racemate monolayers during 2D crystallization of trioxa[11]helicene on Ag(100).
ChemPhysChem. Roč. 22, č. 3 (2021), s. 293-297. ISSN 1439-4235. E-ISSN 1439-7641
R&D Projects: GA ČR(CZ) GX20-13692X; GA MŠMT LM2018110
Research Infrastructure: CESNET II - 90042
Institutional support: RVO:68378271 ; RVO:61388963
Keywords : chirality * molecular self-assembly * SPM
OECD category: Condensed matter physics (including formerly solid state physics, supercond.); Organic chemistry (UOCHB-X)
Impact factor: 3.520, year: 2021
Method of publishing: Limited access
https://doi.org/10.1002/cphc.202000853

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.
Permanent Link: http://hdl.handle.net/11104/0326145