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Synthesis, structures and reactivity of lanthanoid(II) formamidinates of varying steric bulk

机译:不同空间体积的镧系甲酰胺(II)甲酰胺化物的合成,结构和反应性

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摘要

New reactive, divalent lanthanoid formamidinates [Yb(Form) _2(thf)_2] (Form=[RNCHNR]; R=o-MeC_6H_4 (o-TolForm; 1), 2,6-Me_2C_6H_3 (XylForm; 2), 2,4,6-Me_3C_6H_2 (MesForm; 3), 2,6-Et _2C_6H_3 (EtForm; 4), o-PhC_6H _4 (o-PhPhForm; 5), 2,6-iPr_2C_6H_3 (DippForm; 6), o-HC_6F_4 (TFForm; 7)) and [Eu(DippForm) _2(thf)_2] (8) have been prepared by redox transmetallation/protolysis reactions between an excess of a lanthanoid metal, Hg(C_6F_5)_2 and the corresponding formamidine (HForm). X-ray crystal structures of 2-6 and 8 show them to be monomeric with six-coordinate lanthanoid atoms, chelating N,N′-Form ligands and cis-thf donors. However, [Yb(TFForm)_2(thf)_2] (7) crystallizes from THF as [Yb(TFForm)_2(thf)_3] (7 a), in which ytterbium is seven coordinate and the thf ligands are "pseudo-meridional". Representative complexes undergo C-X (X=F, Cl, Br) activation reactions with perfluorodecalin, hexachloroethane or 1,2-dichloroethane, and 1-bromo-2,3,4,5-tetrafluorobenzene, giving [Yb(EtForm)_2F]_2 (9), [Yb(o-PhPhForm)_2F]_2 (10), [Yb(o-PhPhForm) _2Cl(thf)_2] (11), [Yb(DippForm)_2Cl(thf)] (12) and [Yb(DippForm)_2Br(thf)] (16). X-ray crystallography has shown 9 to be a six-coordinate, fluoride-bridged dimer, 12 and 16 to be six-coordinate monomers with the halide and thf ligands cis to each other, and 11 to have a seven-coordinate Yb atom with "pseudo-meridional" unidentate ligands and thf donors cis to each other. The analogous terbium compound [Tb(DippForm)_2Cl(thf)_2] (13), prepared by metathesis, has a similar structure to 11. C-Br activation also accompanies the redox transmetallation/protolysis reactions between La, Nd or Yb metals, Hg(2-BrC _6F_4)_2, and HDippForm, yielding [Ln(DippForm)_2Br(thf)] complexes (Ln=La (14), Nd (15), Yb (16)).
机译:新的反应性二价镧系甲酰胺甲酸酯[Yb(形式)_2(thf)_2](形式= [RNCHNR]; R = o-MeC_6H_4(o-TolForm; 1),2,6-Me_2C_6H_3(XylForm; 2),2, 4,6-Me_3C_6H_2(MesForm; 3),2,6-Et _2C_6H_3(EtForm; 4),o-PhC_6H _4(o-PhPhForm; 5),2,6-iPr_2C_6H_3(DippForm; 6),o-HC_6F_4( TFForm; 7))和[Eu(DippForm)_2(thf)_2](8)已通过过量的镧系元素金属Hg(C_6F_5)_2和相应的甲form(HForm)之间的氧化还原金属转移/质子分解反应制备。 2-6和8的X射线晶体结构显示它们是具有六配位镧系元素原子的单体,螯合N,N'-型配体和顺式-thf供体。但是,[Yb(TFForm)_2(thf)_2](7)从THF中结晶为[Yb(TFForm)_2(thf)_3](7 a),其中y为七个坐标,thf配体为“伪-经络”。代表性配合物与全氟萘烷,六氯乙烷或1,2-二氯乙烷和1-溴-2,3,4,5-四氟苯进行CX(X = F,Cl,Br)活化反应,得到[Yb(EtForm)_2F] _2 (9),[Yb(o-PhPhForm)_2F(thf)_2](10),[Yb(o-PhPhForm)_2Cl(thf)_2](11),[Yb(DippForm)_2Cl(thf)](12)和[ Yb(DippForm)_2Br(thf)](16)。 X射线晶体学分析显示9为六配位的氟桥联二聚体,12和16为六配位的单体,卤化物和thf配体彼此顺式,11为七配位的Yb原子, “伪子午线”不明配体和供体彼此顺式。通过复分解制备的类似ter化合物[Tb(DippForm)_2Cl(thf)_2](13)具有与11相似的结构。C-Br活化还伴随La,Nd或Yb金属之间的氧化还原金属转移/质子分解反应, Hg(2-BrC _6F_4)_2和HDippForm,生成[Ln(DippForm)_2Br(thf)]配合物(Ln = La(14),Nd(15),Yb(16))。

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