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A 4-state acid-base controlled molecular switch based on a host-guest system.

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Researchers developed a novel zinc(II) funnel complex using calix[6]arene macrocycles. This complex acts as a triple molecular switch, demonstrating responsive changes in guest binding based on anion presence and phenol deprotonation.

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Area of Science:

  • Supramolecular Chemistry
  • Macrocyclic Chemistry
  • Coordination Chemistry

Background:

  • Calix[6]arene macrocycles are versatile platforms for host-guest chemistry.
  • Modifying functional groups on macrocycles can tune their binding properties.
  • Previous zinc(II) funnel complexes utilized anisole moieties.

Purpose of the Study:

  • To synthesize and characterize a novel Zn(II) funnel complex incorporating phenol groups within a calix[6]arene macrocycle.
  • To investigate the host-guest properties of the new complex and compare it to a related anisole-based system.
  • To explore the potential of this system as a molecular switch.

Main Methods:

  • Synthesis of the Zn(II) funnel complex featuring three phenol functions on a calix[6]arene scaffold.
  • Host-guest binding studies monitored by proton nuclear magnetic resonance (1H NMR) spectroscopy.
  • Evaluation of anion responsiveness and the effect of phenol deprotonation on host-guest interactions.

Main Results:

  • The dicationic Zn(II) complex exhibits responsiveness to anions.
  • Deprotonation of a phenol unit within the complex completely abolishes its hosting response.
  • One molecular switch derived from this system demonstrates guest embedment changes across four distinct host states, indicating triple switch behavior.

Conclusions:

  • Replacement of anisole with phenol groups in the Zn(II) funnel complex significantly alters its host-guest properties.
  • The system offers tunable molecular switching capabilities based on pH and anion presence.
  • The observed four-state guest embedment change represents a rare example of a triple molecular switch.