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Sandwich-type Inorganic–Organic Hybrid Solids of Iso-polyvanadate Clusters and Decamethylcucurbit[5]uril

Three sandwich-type inorganic–organic hybrid solids based on iso-polyvanadate cluster, {; ; V4O12}; ; 4–, {; ; H2V6O18}; ; 4–, or {; ; H2V10O28}; ; 4–, and decamethylcucurbit[5]uril (Me10CB[5]) have been synthesized under hydrothermal conditions. In the structures of (NH4)4[(V4O12)·(Me10CB[5]@0.5H2O)2]·∼15H2O (1) and (NH4)4[(H2V10O28)·(Me10CB[5]@H2O)2]·∼16H2O (3), tetranuclear {; ; V4O12}; ; 4– or decanuclear {; ; H2V10O28}; ; 4– clusters are sandwiched by (NH4)2@Me10CB[5] closed molecular capsules, through hydrogen-bonding interactions, whereas compound 2, formulated as Li4(H2O)6[(H2V6O18)·(Me10CB[5]@H2O)2]·∼14H2O, is built by hexanuclear {; ; H2V6O18}; ; 4– clusters that are covalently sandwiched by Li2@Me10CB[5] half-open molecular capsules in a way similar to thoset of 1 and 3. Compounds 1–3 represent rare examples of sandwich-type polyoxometalate (POM)-based materials in which POM units are inserted at the inner sphere by either hydrogen or covalent bonds. Compound 2 has shown rational photocatalytic activity toward the degradation of methyl orange solutions under visible light.

Inorganic-Organic Hybrid ; Polyoxometalate

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