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Recognition with metallo cavitands.

Faiz-Ur Rahman1,2, Yong-Sheng Li1,2, Ioannis D Petsalakis3

  • 1Center for Supramolecular Chemistry & Catalysis, Shanghai University, Shanghai 200444, China.

Proceedings of the National Academy of Sciences of the United States of America
|August 21, 2019
PubMed
Summary

Metal complexation of cavitands with quinoxaline walls rigidifies their structure, enhancing molecular recognition and binding of various guests. This study demonstrates improved host-guest complex stability through palladium(II) coordination.

Keywords:
Pd(II) stabilized cavitandcavitandsmetallo cavitandmolecular recognitionwater-soluble containers

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Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Cavitands are molecular hosts with a vase-like structure capable of encapsulating guest molecules.
  • Quinoxaline moieties in cavitands offer potential sites for metal coordination.
  • Understanding how metal complexation affects cavitand properties is crucial for designing advanced molecular recognition systems.

Purpose of the Study:

  • To investigate the impact of metal complexation on the molecular recognition behavior of cavitands featuring quinoxaline walls.
  • To synthesize and characterize metal-cavitand derivatives and evaluate their host-guest complexation properties.
  • To explore how metal coordination influences the conformational dynamics and binding affinities of cavitands.

Main Methods:

  • Synthesis of 2:1 metal:cavitand derivatives using Pd(II) complexation.
  • Characterization via Nuclear Magnetic Resonance (NMR) spectroscopy (¹H, ¹³C), High-Resolution Electrospray Ionization Mass Spectrometry (HR ESI-MS), and computational studies.
  • Host-guest complexation studies using ¹H NMR spectroscopy with various guests (alkanes, alcohols, acids, diols).

Main Results:

  • Palladium(II) ions bridged adjacent quinoxaline panels, forming C₂v symmetric cavitand derivatives.
  • Metal complexation rigidified the cavitand walls, stabilizing the vase conformation.
  • Enhanced binding affinities were observed for both hydrophobic and water-soluble guests compared to non-complexed cavitands.
  • Coordination of Pd(II) slowed the conformational dynamics of the cavitand structure.

Conclusions:

  • Metal complexation, specifically with Pd(II), is an effective strategy to modulate the conformational dynamics and enhance the molecular recognition capabilities of quinoxaline-based cavitands.
  • The rigidification induced by metal coordination leads to more stable host-guest complexes.
  • These findings open avenues for designing tailored supramolecular hosts with improved guest binding properties.