Rotational and constitutional dynamics of caged supramolecules
Edited by Julius Rebek, The Scripps Research Institute, La Jolla, CA, and approved October 5, 2010 (received for review June 24, 2010)
Abstract
The confinement of molecular species in nanoscale environments leads to intriguing dynamic phenomena. Notably, the organization and rotational motions of individual molecules were controlled by carefully designed, fully supramolecular host architectures. Here we use an open 2D coordination network on a smooth metal surface to steer the self-assembly of discrete trimeric guest units, identified as noncovalently bound dynamers. Each caged chiral supramolecule performs concerted, chirality-preserving rotary motions within the template honeycomb pore, which are visualized and quantitatively analyzed using temperature-controlled scanning tunneling microscopy. Furthermore, with higher thermal energies, a constitutional system dynamics appears, which is revealed by monitoring repetitive switching events of the confined supramolecules’ chirality signature, reflecting decay and reassembly of the caged units.
Acknowledgments.
This work was supported by International Graduate School of Science and Engineering and Institute of Advanced Study at Technische Universität München, European Research Council Advanced Grant MolArt (°247299).
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Published online: November 22, 2010
Published in issue: December 14, 2010
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Acknowledgments
This work was supported by International Graduate School of Science and Engineering and Institute of Advanced Study at Technische Universität München, European Research Council Advanced Grant MolArt (°247299).
Notes
This article is a PNAS Direct Submission.
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The authors declare no conflict of interest.
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Rotational and constitutional dynamics of caged supramolecules, Proc. Natl. Acad. Sci. U.S.A.
107 (50) 21332-21336,
https://doi.org/10.1073/pnas.1008991107
(2010).
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