Supramolecular Association between γ-Cyclodextrin and Preyssler-Type Polyoxotungstate

• Main Authors: Nathalie Leclerc, Mohamed Haouas, Clément Falaise, Serge Al Bacha, Loïc Assaud, Emmanuel Cadot
• Format: Article
• Language: English
• Published: MDPI AG 2021-08-01
• Series: Molecules
• Subjects: polyoxometalate; supramolecular adduct; XRD structure; NMR spectroscopy; cyclic voltammetry; electrochemical impedance spectroscopy
• Online Access: https://www.mdpi.com/1420-3049/26/17/5126

The development of hybrid materials based on polyoxometalates constitutes a strategy for the design of multifunctional materials. The slow evaporation of an aqueous solution of [NaP₅W₃₀O₁₁₀]¹⁴⁻ in the presence of γ-Cyclodextrin (γ-CD) led to the crystallization of a K₆Na₈{[NaP₅W₃₀O₁₁₀]•(C₄₈H₈₀O₄₀)}•23H₂O (<b>NaP₅W₃₀</b><b>•1CD</b>) supramolecular compound, which was characterized by single-crystal X-ray diffraction, IR-spectroscopy, thermogravimetric and elemental analyses. Structural analysis revealed the formation of 1:1 {[NaP₅W₃₀O₁₁₀]•[γ-CD]}¹⁴⁻ adduct in the solid state. Studies in solution by cyclic voltammetry, electrochemical impedance spectroscopy, ¹H NMR spectroscopy, and ³¹P DOSY, have demonstrated weak interactions between the inorganic anion and the macrocyclic organic molecule.