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α-Cyclodextrin structure 


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 β-Cyclodextrin structure


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γ-Cyclodextrin structure


In the above structures, the flexible 6-OH hydroxyl groups are shown in the trans (O5-C5-C6-O6 torsion) conformation forming linking hydrogen bonds around the bottom rim of the conical cavity. Such regular linkages are destabilized by dipolar effects, easily dissociated in aqueous solution and not found in cyclodextrin crystals. Normally these O5-C5-C6-O6 torsions are found in the (+)-gauche or (-)-gauche conformations where they may hydrogen bond to the ring oxygen atom of the same glucose residue via a linked water molecule.



These animations use Jmol: an open-source Java viewer for chemical structures in 3D. Use the mouse for control.



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This page was established in 2005 and last updated by Martin Chaplin on 20 July, 2015

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