Synthesis, structure, and magnetism of four polyoxomolybdate compounds containing yttrium and ytterbium

Four new polyoxometalate compounds consisting of Anderson-type anions and trivalent rare earth (RE) cations, [RE 2 (H2O)14M(OH)6Mo6O18][M(OH)6Mo6O18] · 14H2O, RE = Y, M = Cr(1), Al(2); RE = Yb, M = Al(3), Cr(4), have been synthesized in aqueous solution and characterized by elemental analyses, infrared (IR) spectra, thermal gravimetric (TG) analyses, and single crystal X-ray diffraction. [M(OH)6Mo6O18]3− as a bidentate ligand coordinates to two RE 3 + , forming a double-supported cation [RE 2(H2O)14M(OH)6Mo6O18]3+. The cations and other [M(OH)6Mo6O18]3− anions in the crystals are linked via hydrogen bonding interactions tightly, forming four supramolecular compounds. The magnetic properties of 1, 3, and 4 have been examined by measuring their magnetic susceptibilities from 2 to 300 K.