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The reaction of [ α -P₂W 15 O 56 ] 12- with Mn II and Dy III in an aqueous basic solution led to the isolation of an all inorganic heterometallic aggregate Na 10 (OH₂) 42 [{Dy(H₂O)₆}₂Mn₄P₄W 30 O 112 (H₂O)₂]·17H₂O ( Dy₂Mn₄-P₂W 15  ). Single-crystal X-ray diffraction revealed that Dy₂Mn₄-P₂W 15  crystallizes in the triclinic system with space group P 1 ¯ , and consists of a tetranuclear manganese(II)-substituted sandwich-type phosphotungstate [Mn₄(H₂O)₂(P₂W 15 O 56 )₂] 16- ( Mn₄-P₂W 15  ), Na, and Dy III cations. Compound Dy₂Mn₄-P₂W 15  exhibits a 1D ladder-like chain structure based on sandwich-type segments and dysprosium cations as linkers, which are further connected into a three-dimensional open framework by sodium cations. The title compound was structurally and compositionally characterized in solid state by single-crystal XRD, powder X-ray diffraction (PXRD), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric (TGA), and elemental analyses. Further, the absorption and emission electronic spectra in aqueous solutions of Dy₂Mn₄-P₂W 15  and Mn₄-P₂W 15  were studied. Also, magnetic properties were studied and compared with the magnetic behavior of [Mn₄(H₂O)₂(P₂W 15 O 56 )₂] 16- .

Synthesis and Characterization of a Heterometallic Extended Architecture Based on a Manganese(II)-Substituted Sandwich-Type Polyoxotungstate