Abstract
Crystals of per(3,6-anhydro)-α-cyclodextrin{hexakis(3,6- anhydro)cyclomaltohexaose} ( 1) grown in presence of KCl or NaI evidence the similar distorted conformation of macrocycle and provide the same supramolecular scaffolding of cyclodextrins based on CH⋯O hydrogen bonds. Infinite tubes parallel to symmetry axis 6 are filled by water molecules or by iodine atoms in 1/KCl and 1/NaI crystals, respectively. In 1/KCl crystals an inclusion complex of stoichiometry 1:2 has been found. Coordination polyhedra of the dimeric K units fuse with the coordination polyhedra of one pentacoordinated chloride atom to form an infinite helix along the c direction crossing over a helical organic envelope of cyclodextrin molecules.
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