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Updated: Feb 11, 2026

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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Triple Helicate-Tetrahedral Cluster Interconversion Controlled by Host-Guest Interactions.

Markus Scherer1, Dana L Caulder1, Darren W Johnson1

  • 1Department of Chemistry, University of California, Berkeley, CA 94720-1460 USA, Fax: (+1) 510-486-5283.

Angewandte Chemie (International Ed. in English)
|May 2, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a unique ligand for metal-organic cages, forming triple helicates and tetrahedrons. Host-guest interactions with tetramethylammonium ions drive equilibrium towards the tetrahedron, enabling quantitative conversion from helicate to tetrahedron.

Keywords:
Cage compoundsCluster compoundsHelical structuresHost-guest chemistrySupramolecular chemistry

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Designing ligands for predictable self-assembly of metal-organic frameworks (MOFs) is crucial.
  • Controlling the formation of specific supramolecular architectures, like helicates and tetrahedrons, presents a significant challenge.

Purpose of the Study:

  • To design a novel ligand capable of forming distinct supramolecular structures.
  • To investigate the influence of host-guest interactions on the self-assembly equilibrium of metal-organic cages.
  • To achieve quantitative transformation between different supramolecular architectures.

Main Methods:

  • Synthesis of a unique ligand based on 2,6-diaminoanthracene.
  • Coordination studies with metal ions (Titanium and Gallium) to form M2L3 helicates and M4L6 tetrahedrons.
  • Spectroscopic and crystallographic analyses to characterize the formed structures.
  • Investigating the effect of tetramethylammonium ions (Me4N+) on the self-assembly equilibrium.

Main Results:

  • A single ligand design successfully yielded both M2L3 triple helicates and M4L6 tetrahedrons with Ti and Ga ions.
  • The tetrahedron formation, despite being entropically disfavored, was driven by strong host-guest interactions with Me4N+.
  • Quantitative conversion of the helicate to the tetrahedron was achieved upon addition of Me4N+.

Conclusions:

  • The developed ligand demonstrates versatility in forming diverse supramolecular structures.
  • Host-guest complexation can be a powerful strategy to control self-assembly pathways and stabilize specific architectures.
  • This work provides a method for the selective synthesis and interconversion of metal-organic cages.