Molecular Borromean Rings

  title={Molecular Borromean Rings},
  author={Kelly Scott Chichak and Stuart J. Cantrill and Anthony R. Pease and Sheng-Hsien Chiu and Gareth W. V. Cave and Jerry L. Atwood and J. Fraser Stoddart},
  pages={1308 - 1312}
The realization of the Borromean link in a wholly synthetic molecular form is reported. The self-assembly of this link, which is topologically achiral, from 18 components by the template-directed formation of 12 imine and 30 dative bonds, associated with the coordination of three interlocked macrocycles, each tetranucleating and decadentate overall, to a total of six zinc(II) ions, is near quantitative. Three macrocycles present diagonally in pairs, six exo-bidentate bipyridyl and six endo… Expand
A Star of David catenane.
The synthesis of a catenane that consists of two triply entwined 114-membered rings, a molecular link, is described, which provides a powerful strategy for the synthesis of molecular topologies of ever-increasing complexity. Expand
Self-assembly of triangular and hexagonal molecular necklaces.
This work exploits the orthogonality of coordination-driven self-assembly and crown-ether host-guest complexation to obtain a molecular and molecular necklace based on a well-developed recognition motif of 1,2-bis(pyridinium)ethane/dibenzo[24]crown-8. Expand
Helicate extension as a route to molecular wires.
DFT calculations and electrochemical measurements indicate a high degree of electronic delocalization among the metal ions forming the cores of the structures described herein, which may therefore be described as "molecular wires". Expand
Selective Synthesis of Molecular Borromean Rings: Engineering of Supramolecular Topology via Coordination-Driven Self-Assembly.
Crystal structure of BRs revealed that the particular topology was enforced by the appropriate geometry of the metallacycle and multiple parallel-displaced π-π interactions between the donor and tetracene moiety of the acceptor. Expand
Self-assembly of molecular Borromean rings from bimetallic coordination rectangles.
A self-assembly synthetic method which proceeds without the aid of a template has been developed for the formation of molecular rectangles by adjustment of the long-arm length of the rectangles and a series of size-dependent Borromean-link frameworks. Expand
Towards the molecular Borromean link with three unequal rings: double-threaded ruthenium(II) ring-in-ring complexes†
This study describes synthetic efforts towards the molecular Borromean link consisting of three unequal rings. The design and strategy involve step by step construction of a ruthenium(II) templatedExpand
Conformations of large macrocycles and ring-in-ring complexes
A kinetically directed, stepwise approach towards molecular Borromean links enabled the isolation and structural characterization of synthetic intermediates along the way. Here we report theExpand
The template synthesis of dimetallic complexes
Abstract The Fe II ion acts as a template to generate a dinuclear triple-stranded complex, in which two tris-diimine compartments are separated by rigid diphenylurea spacers. The template reactionExpand
Molecular Borromean Rings Based on Half-Sandwich Organometallic Rectangles.
This work has developed a template-free self-assembly method for synthesizing molecular Borromean rings by rationally designing metal-containing precursors and organic ligands, and highlighted efforts to develop empirical guidelines to uncover the relationship between the aspect ratio of metallarectangles and the formation or stability of molecular Boromean rings. Expand
Palladium-templated subcomponent self-assembly of macrocycles, catenanes, and rotaxanes.
The addition of pyridine-containing macrocyclic capping ligands allows for topological complexity to arise, thereby enabling the straightforward preparation of structures that include a [ 2]catenane, a [2]rotaxane, and a doubly threaded [3] rotaxane. Expand


Borromean links and other non-conventional links in ‘polycatenated’ coordination polymers: re-examination of some puzzling networks
The structures of some polymeric networks of the ‘polycatenanes’ class, which have the peculiar feature of all the constituent motifs having lower dimensionality than that of the overall array, are analyzed. Expand
Self-recognition in helicate self-assembly: spontaneous formation of helical metal complexes from mixtures of ligands and metal ions.
The results point to a change in paradigm from pure compounds to instructed mixtures--that is from seeking chemical purity to designing programmed systems composed of mixtures of instructed components capable of spontaneously forming well--defined superstructures through self-processes. Expand
Benzylic Imine Catenates: Readily Accessible Octahedral Analogues of the Sauvage Catenates.
The shape of rings to come: The first members of a new family of simple-to-prepare octahedral analogues of the tetrahedral Sauvage catenates are described. M=Mn2+ , Fe2+ , Co2+ , Ni2+ , Cu2+ , Zn2+ ,Expand
A chiral spherical molecular assembly held together by 60 hydrogen bonds
Spontaneous self-assembly processes that lead to discretespherical molecular structures are common in nature. Sphericalviruses (such ashepatitis B) and fullerenes are well-known examples inwhichExpand
Absolute Configuration and Chemical Topology
  • S. J. Tauber
  • Physics, Medicine
  • Journal of research of the National Bureau of Standards. Section A, Physics and chemistry
  • 1963
The stereochemistry of catenanes, knotted molecules, and Borromean rings is discussed and a suggestion is made concerning the citing of the absolute configuration of molecularly dissymmetric diastereomers. Expand
Molecular Catenanes, Rotaxanes and Knots
The parts of a molecule are connected by chemical bonds such as the covalent bond, the ionic bond, the hydrogen bond, etc. However, as described in many examples in this book, the parts of a moleculeExpand
Ring-in-ring structures from phenanthroline macrocycles with exo- and endotopic binding sites.
[structure: see text] Three metallosupramolecular ring-in-ring structures are assembled using the HETPHEN concept (in the presence of copper(I)) with macrocyclic phenanthrolines exhibiting exotopicExpand
Topological Ideas in Stereochemistry
An attempt is made to assemble data for various branches of organic and biological chemistry which can be related directly to the ideas of topology. Consideration is given to problems of topologicalExpand
Templated organic synthesis
Templates in supramolecular chemistry: 1. Templates in organic synthesis - definitions and roles, H. Anderson molecular imprinting - templated materials for recognition and catalysis, G. WulffExpand
Dynamic covalent chemistry.
Some recent examples where dynamic covalent chemistry has been demonstrated are shown to emphasise the basic concepts of this area of science. Expand