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Preparation of 1° Amines: Azide Synthesis01:22

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Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Towards Building Blocks for Supramolecular Architectures Based on Azacryptates.

Ana Miljkovic1, Sonia La Cognata1, Greta Bergamaschi2

  • 1Department of Chemistry, University of Pavia, V.le Taramelli 12, 27100 Pavia, Italy.

Molecules (Basel, Switzerland)
|April 15, 2020
PubMed
Summary

Researchers synthesized a novel azacryptand ligand (L) and its dicopper complex. This complex shows high affinity for aromatic dicarboxylates, demonstrating potential as building blocks for advanced supramolecular structures.

Keywords:
anion coordinationmolecular cagesnon-covalent interactionsself-assembled systemssupramolecular architectures

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Development of novel ligands for complexation is crucial for supramolecular chemistry.
  • Azacryptands offer unique cage-like structures for molecular recognition.
  • Dicopper complexes can serve as versatile building blocks for advanced materials.

Purpose of the Study:

  • To synthesize a new bis(tris(2-aminoethyl)amine) azacryptand (L) with triphenyl spacers.
  • To investigate the binding properties of its dicopper complex ([Cu2L]4+) for aromatic dicarboxylate anions.
  • To explore the potential of this system as building blocks for supramolecular structures like rotaxanes and pseudo-rotaxanes.

Main Methods:

  • Synthesis of the azacryptand ligand L.
  • Formation and characterization of the dicopper complex [Cu2L]4+.
  • UV-Vis and emission spectroscopy to study anion binding affinities.

Main Results:

  • The dicopper complex [Cu2L]4+ exhibited high affinity for biphenyl-4,4'-dicarboxylate (dfc2-) with a binding constant of 5.46 log units.
  • The ligand's conformational flexibility allowed for good interaction with both long and short aromatic dicarboxylates.
  • A stable 1:1 complex formation was observed, driven by dicarboxylate affinity and hydrophobic interactions.

Conclusions:

  • The synthesized azacryptand dicopper complex is a promising candidate for supramolecular chemistry applications.
  • Its ability to bind aromatic dicarboxylates makes it suitable for constructing rotaxanes and pseudo-rotaxanes.
  • This work provides a foundation for designing new supramolecular devices utilizing non-covalent interactions.