Synthesis, Structure And Characterization Of Polyoxomolybdate Compounds Containing Yttrium And Ytterbium

In this paper, four unreported polyoxometalate compounds have been synthesized in aqueous solution by utilizing B-type Anderson anions [M(OH)₆Mo₆O₁₈]3-(M = Cr and Al ) and trivalent Rare earth cations Y³⁺,Yb³⁺ (RE= Y³⁺,Yb³⁺) and adjusting reaction conditions and reaction materials. The four compounds have been characterized by elemental analyses, IR spectra, TG analyses, and single crystal X-ray diffraction. The magnetic properties of 1, 3 and 4 have been examined by measuring their magnetic susceptibility over the temperature range of 2–300K. Magnetic research shows that compounds 3 and 4 have weak ferromagnetic interactions.[M(OH)₆Mo₆O₁₈]3- anion acting as bi-dentate ligand coordinates to two RE³⁺, forming a double-supported cation [RE2(H₂O)₁₄M(OH)₆Mo₆O₁₈]³⁺. The cations and [M(OH)₆Mo₆O₁₈]3- anions in the crystals are linked together via hydrogen bonding interactions tightly, forming four supramolecular compounds. The chemical formula of the four compounds are: [Y₂(H₂O)₁₄Cr(OH)₆Mo₆O₁₈][Cr(OH)₆Mo₆O₁₈]·14H₂O (1)[Y₂(H₂O)₁₄Al(OH)₆Mo₆O₁₈][Al(OH)₆Mo₆O₁₈]·14H₂O (2)[Yb₂(H₂O)₁₄Al(OH)₆Mo₆O₁₈][Al(OH)₆Mo₆O₁₈]·14H₂O (3)[Yb₂(H₂O)₁₄Cr(OH)₆Mo₆O₁₈][Cr(OH)₆Mo₆O₁₈]·14H₂O (4)...