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A multi-state, allosterically-regulated molecular receptor with switchable selectivity.

Jose Mendez-Arroyo1, Joaquín Barroso-Flores, Alejo M Lifschitz

  • 1Department of Chemistry and International Institute for Nanotechnology, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208, United States.

Journal of the American Chemical Society
|July 10, 2014
PubMed
Summary
This summary is machine-generated.

A novel biomimetic molecular receptor, synthesized using the Weak-Link Approach, exhibits ion-regulated host-guest properties. This adaptable receptor can reversibly capture and release neutral and cationic guests by switching between inactive and active binding configurations.

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Development of synthetic receptors for molecular recognition is crucial.
  • Ion-regulated systems offer tunable host-guest properties.
  • Calixarene-based receptors combined with metal centers provide unique functionalities.

Purpose of the Study:

  • To synthesize and characterize a biomimetic, ion-regulated molecular receptor.
  • To investigate the influence of Pt(II) coordination on receptor conformation and binding.
  • To demonstrate reversible guest capture and release through effector-controlled switching.

Main Methods:

  • Synthesis via Weak-Link Approach (WLA).
  • Host-guest complexation studies using Job plots and 1H NMR spectroscopy.
  • Solid-state structural analysis via single crystal X-ray diffraction.
  • Computational analysis using DFT calculations.

Main Results:

  • A Pt(II)-calix[4]arene receptor with hemilabile (P,S) ligands was synthesized.
  • Receptor conformation and binding properties are modulated by Pt(II) coordination.
  • Three distinct binding states (closed, semiopen, fully open) were identified, recognizing neutral and cationic guests.
  • Reversible guest binding was achieved by switching receptor configurations.

Conclusions:

  • The synthesized receptor demonstrates tunable host-guest chemistry controlled by ion-coordination.
  • This system offers a platform for developing responsive molecular machines and sensors.
  • The ability to switch between binding states allows for controlled capture and release of guest molecules.