An organic–inorganic hybrid Dy(III)-containing polyoxomolybdate based on functionalized diphosphonate ligands

A novel Dy(III)-based organodiphosphonate-functionalized polyoxomolybdate [NH2(CH3)2]3{[Dy(DMF)2(H2O)4]3[Dy(DMF)3{(Mo3O8)(O3PCOCH3PO3)}3]2}∙6DMF·2H2O (1) (DMF = N,N-Dimethylformamide) has been synthesized and characterized by elemental analysis, IR spectrum, thermogravimetric analysis (TG), UV spectroscopy, fluorescence spectroscopy and single-crystal powder X-ray diffraction (PXRD). Compound 1 is composed of two monocapped [Dy(DMF)3{(Mo3O8)(O3PCOCH3PO3)}3]6 − subunits and three [Dy(DMF)2(H2O)4]3 + coordination cations, which contain an internal capsule. The UV spectra indicate that compound 1 is stable in the pH range of 2.76–4.75.

Graphical abstractA novel Dy(III)-based organodiphosphonate-functionalized polyoxomolybdate [NH2(CH3)2]3{[Dy(DMF)2(H2O)4]3[Dy(DMF)3((Mo3O8)(O3PCOCH3PO3))3]2}∙6DMF·2H2O has been successfully synthesized. The polyanion displays a cage-like structure, which is constructed from two monocapped [Dy(DMF)3((Mo3O8)(O3PCOCH3PO3))3]6 − fragments and three [Dy(DMF)2(H2O)4]3 + subunits.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights•Lanthanide-containing organodiphosphonate-functionalized polyoxomolybdates are rare.•A Dy(III)-based polyoxomolybdate constructed by HEDP ligand was obtained.•The hybrid compound 1 displays a unique cage-like structure.•The UV spectra indicate that 1 is stable in a certain pH range.