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Transformations in Chemically Responsive Copper-Calixarene Architectures.

Edmundo G Percástegui1,2, Carlos Reyes-Mata1, Marcos Flores-Alamo3

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Summary
This summary is machine-generated.

Bis-picolyl-appended calix[4]arene self-assembles with copper salts into dynamic multinuclear architectures. These supramolecular structures reconfigure in response to chemical stimuli, exhibiting tunable luminescence properties.

Keywords:
calixarenescopper complexesself-assemblystimuli-responsivenesssupramolecular chemistry

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Calix[4]arenes are versatile macrocyclic hosts with tunable properties.
  • Copper-based supramolecular assemblies offer diverse structural motifs and functionalities.
  • Stimuli-responsive materials are crucial for advanced applications.

Purpose of the Study:

  • To investigate the self-assembly of bis-picolyl-appended calix[4]arene (L) with copper(I) and copper(II) salts.
  • To explore the structural reconfigurations of resulting multinuclear architectures in response to chemical stimuli.
  • To characterize the luminescence properties and stimuli-responsiveness of these copper-arene supramolecular systems.

Main Methods:

  • Synthesis and characterization of multinuclear copper-arene complexes.
  • Crystallography to determine the solid-state structures of assemblies.
  • Spectroscopic methods (e.g., luminescence) to study solution behavior and stimuli-responsiveness.

Main Results:

  • Selective formation of dinuclear and tetranuclear copper(I) macrocycles (e.g., Cu2L2X2 and Cu4L2X4) with CuX (X=Br, I).
  • Formation of copper(II) macrocycles (Cu2L2Cl4) and cages ([Cu2L4(μ-Cl)]3+) with CuCl2, responsive to solvent and CuCl2 addition.
  • Luminescence emission observed, with notable luminescence thermochromism in a tetranuclear copper(I) assembly (4).

Conclusions:

  • Bis-picolyl-appended calix[4]arene acts as a versatile ligand for constructing diverse copper-based supramolecular architectures.
  • These architectures exhibit dynamic structural reconfigurations triggered by external chemical stimuli.
  • The developed copper-arene supramolecular systems demonstrate potential for stimuli-responsive luminescent materials.