A new series of lanthanoid containing Keggin-type germanotungstates with acetate chelators: [{Ln(CH3COO)GeW11O39(H2O)}2]12− {Ln=EuIII, GdIII, TbIII, DyIII, HoIII, ErIII, TmIII, and YbIII}

A series of head-on complexes of lanthanoid containing germanotungstates was isolated from a one pot reaction in an acetate buffer at pH 4.5. This convenient approach brought forward the [{Ln(CH3COO)GeW11O39(H2O)}2]12− (Ln=EuIII, GdIII, TbIII, DyIII, HoIII, ErIII, TmIII, and YbIII) family with acetate chelators in the rarely observed μ2: η2–η1 mode. All compounds were structurally characterized using various solid state analytics, such as single crystal X-ray diffraction, FT-IR spectroscopy, and thermogravimetric analysis. The isostructural polyanions crystallize in the monoclinic system (S.G. P21/c). Temperature-dependent magnetic susceptibility measurements were performed on the GdIII-complex which exhibits near perfect Curie-type behavior.

A new series of acetate-chelated lanthanoid containing germanotungstates [{Ln(CH3COO)GeW11O39(H2O)}2]12− (Ln=Eu to Yb) is available from a convenient one-pot reaction. The influence of the lanthanide contraction on the structural properties is discussed and the magnetic properties of the Gd-representative are investigated in detail.Figure optionsDownload as PowerPoint slideResearch Highlights
► Lanthanoid containing germanotungstates with acetate chelators in μ2 : η2–η1 mode.
► Lanthanoid contraction in [{Ln(CH3COO)GeW11O39(H2O)}2]12− (Ln=EuIII–YbIII).
► Facile one-pot synthesis of the lanthanoid containing germanotungstate series.