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Related Experiment Videos

Two oxazane macrocycles.

Philip J Cox1, Paul KongThoo Lin

  • 1School of Pharmacy, The Robert Gordon University, Schoolhill, Aberdeen AB10 1FR, Scotland. p.j.cox@rgu.ac.uk

Acta Crystallographica. Section C, Crystal Structure Communications
|May 8, 2004
PubMed
Summary
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The study reveals distinct conformations for 20-membered and 18-membered tetraoxa-tetraaza macrocycles. Crystal structures show these macrocycles form 3D networks through hydrogen bonding with chloride anions.

Area of Science:

  • Supramolecular Chemistry
  • Crystal Engineering
  • Macrocyclic Chemistry

Background:

  • Macrocyclic compounds are vital in host-guest chemistry and molecular recognition.
  • Understanding the conformational preferences and solid-state structures of macrocycles is key to designing new functional materials.

Purpose of the Study:

  • To elucidate the conformational behavior of two tetraoxa-tetraaza macrocycles with different ring sizes.
  • To investigate the crystal packing and intermolecular interactions in their tetrahydrochloride salts.

Main Methods:

  • Single-crystal X-ray diffraction analysis was employed to determine the three-dimensional structures.
  • Conformational analysis was performed on the determined crystal structures.

Main Results:

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  • The 20-membered macrocycle (1,7,11,17-tetraoxa-2,6,12,16-tetraazacycloeicosane) adopted an endo conformation.
  • The 18-membered macrocycle (1,6,10,15-tetraoxa-2,5,11,14-tetraazacyclooctadecane) adopted a symmetrical conformation around an inversion center.
  • Both compounds formed planar sheets via N-H...Cl hydrogen bonds, which further assembled into 3D networks through C-H...Cl hydrogen bonds.

Conclusions:

  • The ring size significantly influences the conformational preferences of these tetraoxa-tetraaza macrocycles.
  • Hydrogen bonding interactions play a crucial role in the self-assembly of these macrocyclic compounds in the solid state, leading to extended network structures.