Configuration determination of flexible tetracarboxylate ligands in two supramolecular structures

Two supramolecular structures have been prepared using flexible (2S,3S,4R,5R)-tetrahydrofurantetracarboxylic acid (H4Laa) and cis,cis,cis-1,2,3,4-cyclopentanetetracarboxylic acid (H4Lbb) under similar conditions; Laa retains its original meso configuration, while Lbb undergoes configuration conversion to the racemic form.