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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。
In order to investigate the properties of substituted cyclopentadienyl or bridged cyclopentadienyl organic rare earth compounds, the reaction of carbon bridged fluorenylcyclopentadienyl ligands with rare earth halides was studied. Among them, [2- (9- (Flu (Me) 2CCp]] with ytterbium tribromide (YbBr3) in tetrahydrofuran (THF) to give the title complex [Flu (μ-Br) 2Li (THF) 2. THF. The results of X-ray single crystal structure show that the complex belongs to the monoclinic system with space group P2 (1) / n. The unit cell parameters are: 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. The central Yb atom is bonded to two cyclopentadienyl groups and two bromine atoms, respectively, forming a distorted tetrahedral coordination structure. The bond lengths of Yb-Br1 and Yb-Br2 are 0.2765 (1) and 0.2738 (1) nm, respectively. The angle between the two cyclopentadienyl planes is 125.7 °. The center of the Yb-Br1 and Yb- The average distance is 0.232 and 0.231 nm, respectively.