期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 52, 页码 26932-26938出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202107708
关键词
dynamics; enantioselectivity; host-guest systems; monolayers; self-assembly
资金
- German Research Foundation (DFG) [SPP1928]
- TUM International Graduate School of Science and Engineering (IGSSE) [GSC 81]
- Excellence Cluster e-conversion
- JNCASR, Bangalore, India
- Technical University of Munich (TUM) International Office
- Japan Society for the Promotion of Science (JSPS) Overseas Research Fellowship
- Projekt DEAL
Tailored nano-spaces can control enantioselective adsorption and molecular motion through the spontaneous assembly of a dynamic system on Ag(111) using 2,6-bis(1H-pyrazol-1-yl)pyridine-4-carboxylic acid. The network cavity snugly hosts the chemically modified guest, bestows enantiomorphic adsorption, and allows selective rotational motions. Hydrogen bonding plays a crucial role in stabilizing the rotating guest and influencing the energy landscape formation.
Tailored nano-spaces can control enantioselective adsorption and molecular motion. We report on the spontaneous assembly of a dynamic system-a rigid kagome network with each pore occupied by a guest molecule-employing solely 2,6-bis(1H-pyrazol-1-yl)pyridine-4-carboxylic acid on Ag(111). The network cavity snugly hosts the chemically modified guest, bestows enantiomorphic adsorption and allows selective rotational motions. Temperature-dependent scanning tunnelling microscopy studies revealed distinct anchoring orientations of the guest unit switching with a 0.95 eV thermal barrier. H-bonding between the guest and the host transiently stabilises the rotating guest, as the flapper on a raffle wheel. Density functional theory investigations unravel the detailed molecular pirouette of the guest and how the energy landscape is determined by H-bond formation and breakage. The origin of the guest's enantiodirected, dynamic anchoring lies in the specific interplay of the kagome network and the silver surface.
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