节点文献
[Flu(Me)2CCp]2Yb(μ-Br)2Li(THF)2·THF的合成和晶体结构
Synthesis and Crystal Structure of Bis[[2-(fluoren-9-yl)isopropyl] Cyclopentadienyl] Ytterbium-di-μ-bromo-bis(tetrahydrofuran)lithium Monotetrahydrofuran
【摘要】 为考察取代环戊二烯基或桥联环戊二烯基有机稀土化合物的性质,研究了碳桥联芴基环戊二烯基配体与卤化稀土的反应,其中,[2-(9-芴基)异丙基]环戊二烯基锂[Flu(Me)2CCpLi]与三溴化镱(YbBr3)在四氢呋喃(THF)中反应,分离得到了标题配合物[Flu(Me)2CCp]2Yb(μ-Br)2Li(THF)2.THF。X射线单晶结构测定表明配合物属单斜晶系,空间群为P2(1)/n,晶胞参数为:a=1.4676(3)nm,b=1.2618(4)nm,c=2.9736(9)nm,β=98.172(18)°,Z=4,V=5.451(2)nm3,Mr=1098.84,Dc=1.339 mg.m-3,R=0.0695,wR=0.1721。中心Yb原子分别与两个环戊二烯基和两个溴原子成键,形成扭曲的四面体配位构型。Yb-Br1和Yb-Br2键长分别为0.2765(1)和0.2738(1)nm,两个环戊二烯基平面的夹角为125.7°,中心Yb原子与两个环戊二烯基环中心的平均距离分别为0.232和0.231 nm。
【Abstract】 The title complex,[Flu(Me)2CCp]2Yb(μ-Br)2Li(THF)2·THF,was isolated from the reaction of [Flu(Me)2CCpLi] and YbBr3 in THF.X-ray diffraction analysis indicates that the crystal of the complex is of monoclinic,space group P2(1)/n,with a=1.4676(3) nm,b=1.2618(4) nm,c=2.9736(9) nm,β=98.172(18)°,V=5.451(2) nm3,Mr=1098.84,Z=4,Dc=1.339 mg·m-3,R=0.0695,and wR=0.1721.The complex is an asymmetric μ-Br-bridged dimer containing lanthanide and alkali metal elements.The coordination polyhedron around the Yb atom is a distorted tetrahedron defined by the centroids of the cyclopentadienyl rings and the two Br atoms.The Yb-Br1 and Yb-Br2 distances are 0.2765(1) and 0.2738(1) nm,respectively.The angle of two planes of the cyclopentadienyl rings is 125.7°.The Yb-ring centroid(Cn) distances are 0.232 and 0.231 nm,respectively.
- 【文献出处】 中国稀土学报 ,Journal of the Chinese Rare Earth Society , 编辑部邮箱 ,2006年04期
- 【分类号】O614.33
- 【下载频次】69