A New 2D Fluorescent Polyoxometalate Built up of Circular {P5W30} Clusters and Tb3+ Cations

A new all inorganic polyoxometalate (POM), which is composed of the Na(H₂O)P₅W₃₀O₁₁₀]^14– ({P₅W₃₀}) clusters and Tb³⁺ cations, Na₂Tb₄(H₂O)₂₈{Na(H₂O)P₅W₃₀O₁₁₀}] · 16H₂O ( 1 ), was obtained by using hydrothermal method. Its structure was further characterized by single-crystal X-ray diffraction, elemental analysis, IR spectroscopy, TG, and PXRD. Compound 1 displays a 2D layered structure formed by {P₅W₃₀} clusters and Tb(H₂O)₇]³⁺ linkers. It noteworthy that, eight coordinated sites provided by {P₅W₃₀} was very rare. Furthermore, the luminescent property of compound 1 was reported.