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A 12-Crossing Vertex-Fused Double-Triangle [5]Catenane with Programmed Topological Handedness.

Zheng Cui1,2, Li-Yan Hao1, Jin-Ping Chang3

  • 1Key Laboratory of Green Chemical Media and Reactions (Ministry of Education), Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, P. R. China.

Angewandte Chemie (International Ed. in English)
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PubMed
Summary
This summary is machine-generated.

Researchers created a complex molecule with predictable handedness using coordination-driven self-assembly. This breakthrough in mechanically interlocked molecules (MIMs) utilizes Hopf links to control topological chirality.

Keywords:
catenaneschemical topologycoordination‐driven self‐assemblymechanical chiralitymechanically interlocked molecules

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Chemical Topology

Background:

  • Mechanically interlocked molecules (MIMs) offer unique stereochemical properties due to their dense entanglement.
  • Achieving predictable handedness in high-crossing MIMs remains a significant challenge in chemical synthesis.

Purpose of the Study:

  • To develop a method for synthesizing complex, high-crossing MIMs with controlled topological handedness.
  • To investigate the role of Hopf links in directing stereochemistry during self-assembly.

Main Methods:

  • Coordination-driven self-assembly of metal-organic frameworks.
  • Synthesis of a 12-crossing vertex-fused double-triangle [5]catenane (Rh-2R).
  • X-ray crystallography for structural and topological analysis.

Main Results:

  • Successfully synthesized Rh-2R, a complex [5]catenane with a T(3,3)#T(3,3) topology.
  • Demonstrated that the topological handedness of Rh-2R directly correlates with the helicity of its Hopf-link motifs.
  • Showed that ligand enantiomer dictates product handedness in both solution and solid states.
  • Identified solvent composition and ligand steric demand as key factors modulating interlocking and entanglement.

Conclusions:

  • Hopf links can function as effective stereochemical directors in the construction of complex topologically chiral molecules.
  • The developed coordination-driven self-assembly approach provides access to predictable handedness in high-crossing MIMs.
  • This work advances the design and synthesis of sophisticated molecular architectures with tailored topological properties.