Four transition-metal-bridging risedronate-based polyoxomolybdates: Syntheses, structures, characterizations and magnetic properties

• Four structurally novel transition-metal-bridging risedronate-based polyoxomolybdates (PODs) were well established and characterized.
• The face-sharing {MoO6} octahedra are employed and compound 4 is the first example containing isomeric polyanions 4a and 4b in organophosphonate-based PODs.
• Magnetic investigations indicate that compounds 1 and 4 displays ferromagnetic and antiferromagnetic interactions, respectively.

Four structurally novel transition-metal (TM)-bridging risedronate (Ris)-based polyoxomolybdates (Ris-based PODs), Cs4Na2[{MO(H2O)2}(Mo2O5L)]2·16H2O [M = Ni (1), Co (2)], Cs2Na2H[(CrO2){(Mo2O5)(HL)}2]·17H2O (3) Cs11Na4H7[MnO2{HL(Mo2O5)MnO2(H2O)(Mo2O4) L}2]2·26H2O (4) [L = {O3PC(O)(CH2-3-C5NH4)PO3}, HL = {O3PC(O)(CH2-3-C5NH5)PO3}], have been presented through conventional aqueous solution and characterized by single crystal X-ray diffraction and PXRD, SEM images and EDX analyses, IR and UV spectra, elemental analyses and X-ray photoelectron spectroscopy. Compared to the reported edge-sharing {MoV2O4}, the face-sharing building block {Mo2VIO5} is employed in compounds 1–4, which are uncommon in Ris-based PODs. Furthermore, preliminary variable-temperature magnetic susceptibility measurements indicate that 1 and 4 display weak ferromagnetic behaviors and antiferromagnetic interactions, respectively.

The characterizations and the magnetic properties of the synthesized four structurally novel TM-bridging Ris-based PODs were well established in this paper.Figure optionsDownload high-quality image (197 K)Download as PowerPoint slide