Syntheses of bimetallic lanthanide bis(amido) complexes stabilized by bridged bis(guanidinate) ligands and their catalytic activity toward the hydrophosphonylation reaction of aldehydes and ketones
作者:Kun Nie、Chengwei Liu、Yong Zhang、Yingming Yao
DOI:10.1007/s11426-015-5407-9
日期:2015.9
A series of bimetallic lanthanide bis(amido) complexes stabilized by bridged bis(guanidinate) ligands [(Me3Si)2N]2Ln[(RN)2-CN(CH2)2]}2 [R= i Pr, Ln=Sm (1), Yb (2), Y (3); R=cyclohexyl (Cy), Ln=Sm (4), and Yb (5)] were synthesized through the metathesis reactions of Ln(µ-Cl)[N(SiMe3)2]2(THF)}2 (Ln=Sm, Yb, Y) with lithium guanidinate Li[(RN)2CN(CH2)2]}2 (R= i Pr, Cy), the latter of which was generated
一系列双金属镧系双(酰胺)配合物,由桥联的双(胍基)配体[(Me 3 Si)2 N] 2 Ln [(RN)2 -CN(CH 2)2 ]} 2 [R = i Pr ,Ln = Sm(1),Yb(2),Y(3); 通过Ln(µ-Cl)[N(SiMe 3)2 ] 2(THF)} 2(Ln )的复分解反应合成R =环己基(Cy),Ln = Sm(4)和Yb(5)]。= Sm,Yb,Y)和胍基锂Li [(RN)2 CN(CH 2) 2 ]} 2(R =i Pr,Cy),后者通过碳二亚胺与锂酰胺的反应原位产生。配合物1 - 5被很好地表征通过元素分析,红外光谱,和(复杂3)核磁共振光谱。所有的复合物的固态分子结构经单晶X-射线分析的与复杂的例外确定3 ,显示出类似的未溶剂化的中心对称双核结构。每个镧系中心与来自胍盐配体的两个氮原子和来自两个酰胺基的两个氮原子四配位。哌嗪环在所有情况下均采用椅子构