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Keywords:

  • crystallography;
  • foldamers;
  • helical structures;
  • host–guest systems;
  • quasi-racemic
Thumbnail image of graphical abstract

Racemic on the outside, but not inside: Aromatic-foldamer hosts are enantiomers and as such prefer to co-crystallize even though the guests (e.g. L-tartaric acid, see picture) in each host are not present as enantiomers. This behavior allows a one-step structure elucidation of diastereomeric and quasi-racemic structures in the solid state.