Abstract
Well-defined lanthanide polysulfide complexes containing S4(2-) and S5(2-) ligands, the samarium(iii) pentasulfide complex Sm(Tp(iPr2))(κ(1)-3,5-(i)Pr2Hpz)(S5) and the tetrasulfide-bridged binuclear ytterbium(iii) complex (μ-S4)[Yb(Tp(iPr2))(κ(1)-3,5-(i)Pr2Hpz)(κ(2)-3,5-(i)Pr2pz)]2 (Tp(iPr2) = hydro-tris(3,5-diisopropylpyrazolyl)borate), have been synthesized and structurally characterized by single-crystal X-ray diffraction.
Highlights
Polysulfides of the rare-earth metals (Ln) have been known for over 100 years.[1,2] The most common types of these materials are LnS2 3,4 and LnS2−x,5,6 but well-defined, more complicated species such as Ln8S14.9 (Ln = Dy, Ho) have been described.[7]
We describe here the formation and structural characterization of the first lanthanide polysulfide complexes containing the S42− and S52− ligands, namely Sm(TpiPr2)(κ1-3,5-iPr2Hpz)(S5) (3) and (μ-S4)[Yb(TpiPr2)(κ1-3,5-iPr2Hpz)(κ2-3,5-iPr2pz)]2 (5)
Compound 5 is a dinuclear ytterbium(III) polysulfide complex in which two [Yb(TpiPr2)(κ1-3,5-iPr2Hpz)(κ2-3,5-iPr2pz)] moieties are bridged by a μ-S42− ligand
Summary
Stabilization of molecular lanthanide polysulfides by bulky scorpionate ligands†‡. Marcel Kühling,a Robert McDonald,b Phil Liebing,a Liane Hilfert,a Michael J. Well-defined lanthanide polysulfide complexes containing S42− and S52− ligands, the samarium(III) pentasulfide complex Sm(TpiPr2)(κ1-3,5-iPr2Hpz)(S5) and the tetrasulfide-bridged binuclear ytterbium(III) complex (μ-S4)[Yb(TpiPr2)(κ1-3,5-iPr2Hpz)(κ2-3,5-iPr2pz)]2 (TpiPr2 = hydro-tris(3,5-diisopropylpyrazolyl)borate), have been synthesized and structurally characterized by single-crystal X-ray diffraction
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