Tris(pyrazolyl)methanide Complexes of Trivalent Rare-Earth Metals
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https://figshare.com/articles/dataset/Tris_pyrazolyl_methanide_Complexes_of_Trivalent_Rare_Earth_Metals/3124558
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资源简介：
Three
types of trivalent rare-earth-metal complexes supported by
a monoanionic tris(pyrazolyl)methanide ligand were synthesized and
structurally characterized, and the catalytic activity of the dialkyl
derivatives for isoprene polymerization was investigated. Reactions
of the lithium salt of tris(3,5-dimethylpyrazolyl)methanide LLi(THF) with 1 equiv of ScCl3(THF)3, YCl3, or LuCl3 in THF provided the ion-pair
complexes [LLnCl3][Li(THF)4] (Ln
= Sc (1), Y (2), Lu (3)). Dialkyl
complexes LLn(CH2SiMe3)2(THF) (Ln = Y (4), Lu (5)) were prepared
by salt metathesis of LLi(THF) with 1 equiv of [Y(CH2SiMe3)2(THF)3][BPh4] or [Lu(CH2SiMe3)2(THF)3][BPh4]
in toluene. Reaction of 5 with PhSiH3 provided
the unexpected alkylidene-bridged dinuclear complex L2Lu2(μ-η1:η1-3,5-(CH3)C3HN2)2(μ-CHSiMe3) (6). Complexes 1–6 were structurally characterized by single-crystal
X-ray diffraction, showing that the tris(pyrazolyl)methanide ligand
acts as a κ3-coordinating six-electron donor in all
complexes. The dialkyl complexes catalyzed 1,4-cis polymerization
of isoprene with high selectivity upon activation with borate and
alkylaluminum.
创建时间：
2016-05-17
