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      Coordination-driven self-assembly of a molecular figure-eight knot and other topologically complex architectures

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          Abstract

          Over the past decades, molecular knots and links have captivated the chemical community due to their promising mimicry properties in molecular machines and biomolecules and are being realized with increasing frequency with small molecules. Herein, we describe how to utilize stacking interactions and hydrogen-bonding patterns to form trefoil knots, figure-eight knots and [2]catenanes. A transformation can occur between the unique trefoil knot and its isomeric boat-shaped tetranuclear macrocycle by the complementary concentration effect. Remarkably, the realization and authentication of the molecular figure-eight knot with four crossings fills the blank about 4 1 knot in knot tables. The [2]catenane topology is obtained because the selective naphthalenediimide (NDI)-based ligand, which can engender favorable aromatic donor-acceptor π interactions due to its planar, electron-deficient aromatic surface. The stacking interactions and hydrogen-bond interactions play important roles in these self-assembly processes. The advantages provide an avenue for the generation of structurally and topologically complex supramolecular architectures.

          Abstract

          Molecular knots and links continue to fascinate synthetic chemists. Here, the authors use stacking and hydrogen-bonding interactions between a set of similar building blocks to construct several complex molecular topologies, including a figure-eight knot and a trefoil knot.

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          Functional Molecular Flasks: New Properties and Reactions within Discrete, Self-Assembled Hosts

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            Coordination assemblies from a Pd(II)-cornered square complex.

            The [enPd(II)]2+ (en = ethylenediamine) unit has emerged as a versatile building block in molecular self-assembly. In particular, the 90 degrees coordination angle of the metal has been judiciously used in the design of new discrete two- and three-dimensional structures. Our last 15 years of work with the Pd(II)-cornered unit is summarized in this Account, from the spontaneous formation of a Pd4 square metal complex to a family of architectures such as cages, bowls, boxes, tubes, catenanes, and spheres.
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              Recent Developments in the Preparation and Chemistry of Metallacycles and Metallacages via Coordination.

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                Author and article information

                Contributors
                gxjin@fudan.edu.cn
                Journal
                Nat Commun
                Nat Commun
                Nature Communications
                Nature Publishing Group UK (London )
                2041-1723
                3 May 2019
                3 May 2019
                2019
                : 10
                : 2057
                Affiliations
                ISNI 0000 0001 0125 2443, GRID grid.8547.e, Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Material, State Key Laboratory of Molecular Engineering of Polymers, , Fudan University, ; 2005, Songhu Road, 200438 Shanghai, The People’s Republic of China
                Article
                10075
                10.1038/s41467-019-10075-6
                6499799
                fd0b1107-8336-4391-93ba-dfe036d94639
                © The Author(s) 2019

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 15 October 2018
                : 8 April 2019
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                © The Author(s) 2019

                Uncategorized
                coordination chemistry,interlocked molecules
                Uncategorized
                coordination chemistry, interlocked molecules

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