- Synthesis and Crystal Structures of Aminobis(phenolate) Lanthanocenes
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The protonolysis of Cp3Ln with 1 equivalent of LH2 (LH2 = Me2NCH2CH2CH2N{CH2-(3,5-tBu2-C6H2-2-OH)}2) or salt metathesis of anhydrous LnCl3 with 1 equivalent of LNa2 and 1 equivalent of CpNa in THF afforded heteroleptic aminobis(phenolate) lanthanocene complexes of LLnCp(THF)2 (Ln = Sm(1), Er(2), Yb(3)) in good yields. Complexes 1-3 were characterized by infrared spectra, elemental analyses, and X-ray crystallography. The structural analysis indicated that the L2- ligand in each of these complexes adopt an O,N,O-tridentate coordination mode.
- Zhang, Manman,Yuan, Fugen,Li, Li,Zhu, Xuehua
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- Stannocene as cyclopentadienyl transfer agent in transmetalation reactions with lanthanide metals for the synthesis of tris(cyclopentadienyl)lanthanides
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Transmetalation of the lanthanide metals samarium and ytterbium with bis(cyclopentadienyl)tin(II), stannocene, (η5-C5H 5)2Sn as cyclopentadienyl transfer agent yields the tris(cyclopentadienyl)lanthanides (η5-C5H 5)3Ln (in toluene), (η5-C5H 5)3Ln·THF (Ln = Sm, Yb) and bis(cyclopentadienyl) ytterbium, (η5-C5H5)2Yb· THF in a direct, facile, high-yield and halide-free route. In toluene the base-free forms (η5-C5H5)3Ln are isolated directly. In THF the adducts (η5-C5H 5)3Ln·THF are obtained in crystalline form. At a 1:1 molar ratio of Yb:Sn the ytterbium metal reduces the initially formed (η5-C5H5)3Yb·THF to (η5-C5H5)2Yb·THF.
- Janiak, Christoph
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- Reactivity of neodymium and samarium nitrides
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The reaction of NdN and SmN with iodine gave the iodide-nitrides (NdI2)3N(DME)4 and (SmI)3N2(THF)2, which are inert towards sulfur, in contrast to the neodymium and dysprosium iodide-nitrid
- Kuzyaev, Dmitry M.,Maleev, Alexander A.,Kulikova, Tatyana I.,Vorozhtsov, Dmitry L.,Bochkarev, Mikhail N.
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- Flexible coordination mode of a donor-functionalized terphenyl ligand in monomeric Cp-based lanthanocenes
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Summary: The synthesis and structural characterization of monomeric Cp-based metallocene compounds of the rare-earth elements samarium, yttrium, and ytterbium of general composition Cp2LnDanip (Danip = 2,6-di-o-anisyphenyl) is reported, featuring a donor-functionalized terphenyl moiety as a coligand. Depending on the size of the rare-earth element employed, different coordination modes of the terphenyl moiety are observed. In the case of the relatively large samarium cation both methoxy groups from the terphenyl ligand symmetrically coordinate to the metal cation. However, when smaller cations (yttrium and ytterbium) are employed, a flexible, asymmetric coordination mode of the terphenyl ligand is found.
- Rabe, Gerd W.,Riederer, Florian A.,Zhang-Presse, Mei,Rheingold, Arnold L.
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p. 5277 - 5280
(2010/01/30)
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- SYNTHESIS, CHARACTERIZATION AND STUDY OF THE THERMAL STABILITY OF DIMERIC BIS(CYCLOPENTADIENYL)LANTHANIDE FURYLMETHOXIDE COMPLEXES
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Four new binuclear organolanthanide alkoxides [Cp2Ln(OCH2CCHCHCHO)], (Cp=5H5; Ln = Nd, Sn, Dy, Yb) have been synthesized by simple metathetical reaction of Cp3Ln with furfuryl alcohol in THF (tetrahydrofuran) solution at room temperature. These complexes were characterized by elemental analyses, IR, XPS (X-ray photoelectron spectra) and Ms spectra, indicating that they are dimers bridged bz the oxygen atoms of furylmethoxideligands and intramolecular five-membered chelate rings formed by chelating coordinationof furan rings exist in the title complexes. The thermal stability of all the complexes has been studied and compared. It was found that the Nd and Sm complexes are thermally unstable and tend to decomposeinto Cp, Ln and Ln(OR), species upon heating.
- Wu, Zhong-Zhi,Huang, Zu-En,Cai, Rui-Fang
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p. 1401 - 1416
(2008/10/09)
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