A First Cyclodextrin-Transition Metal Coordination Polymer

The synthesis, X-ray crystallographic structure, and water uptake measurements of the first coordination polymer made of a cyclodextrin and a transition metal ion (in this case, Cu 2+ ) are shown. This coordination polymer is made by connecting paddle-wheel Cu 2+ units through a γ-cyclodextrin functionalized with eight carboxylate groups, is stable in water, and shows selective water-induced reversible structural transformations.