Surface Diffusion Aided by a Chirality Change of Self-Assembled Oligomers under 2D Confinement.

Autor: Bera A; Physikalische Chemie I, Ruhr-Universität Bochum, Universitätsstr. 150, 44801, Bochum, Germany., Henkel S; Organic Chemistry II, Ruhr-Universität Bochum, Universitätsstr. 150, 44801, Bochum, Germany., Mieres-Perez J; Computational Biochemistry, Universität Duisburg-Essen, Universitätsstr. 2, 45141, Essen, Germany., Andargie Tsegaw Y; Organic Chemistry II, Ruhr-Universität Bochum, Universitätsstr. 150, 44801, Bochum, Germany., Sanchez-Garcia E; Computational Biochemistry, Universität Duisburg-Essen, Universitätsstr. 2, 45141, Essen, Germany., Sander W; Organic Chemistry II, Ruhr-Universität Bochum, Universitätsstr. 150, 44801, Bochum, Germany., Morgenstern K; Physikalische Chemie I, Ruhr-Universität Bochum, Universitätsstr. 150, 44801, Bochum, Germany.
Jazyk: angličtina
Zdroj: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2022 Oct 24; Vol. 61 (43), pp. e202212245. Date of Electronic Publication: 2022 Sep 29.
DOI: 10.1002/anie.202212245
Abstrakt: Chirality switching of self-assembled molecular structures is of potential interest for designing functional materials but is restricted by the strong interaction between the embedded molecules. Here, we report on an unusual approach based on reversible chirality changes of self-assembled oligomers using variable-temperature scanning tunneling microscopy supported by quantum mechanical calculations. Six functionalized diazomethanes each self-assemble into chiral wheel-shaped oligomers on Ag(111). At 130 K, a temperature far lower than expected, the oligomers change their chirality even though the molecules reside in an embedded self-assembled structure. Each chirality change is accompanied by a slight center-of-mass shift. We show how the identical activation energies of the two processes result from the interplay of the chirality change with surface diffusion, findings that open the possibility of implementing various functional materials from self-assembled supramolecular structures.
(© 2022 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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