Syntheses of （C5H9C5H4）2LnCl（THF）n （Ln=Nd, Sm, Er, Yb） and crystal structure of [（C5H9C5H4）2-LnCl（THF）n]2（Ln=Sm, n=1;Ln=Er, n=0）

Reactions of lanthanoid trichlorides with sodium cyclopentylcyclopentadienyl in THFafford bis（cyclopentylcyclopentadienyl） lanthanoid chloride complexes （CHCH）LnCl（THF）（Ln=Nd, Sm, n=1; Ln= Er, Yb, n= 0）. The compound [CP’SmCl（THF）]（2） （Cp’ =cyclopentylcy-clopentadienyl） crystallizes from mixed solvent of hexane and THF in monoclinic space group P/cwith a = 11.583 （3）, b = 23.019（6）, c = 8.227 （2）, β= 90.26 （2）°, V= 2194 （1）, D= 1.59 g/cm.μ= 28.6 cm, F（000） = 1060, Z= 2 （dimers）. Its crystal molecule is a dimer with a crystallographicsymmetry center. The central metal atom Sm is coordinated to two Cp’ rings, two bridging chlorineatoms and one THF forming a distorted trigonal bipyramid. The crystal of [Cp’ErCl]（3） belongs tothe triclinic space group P with a = 11.264 （2）, b= 13.296（5）, c = 14.296（6）, a = 96.99 （3）, β=112.47（2）, γ= 102.78（2）°, V= 1865（1）, D= 1.67 g /cm, μ= 48.0 cm, F（000） = 924, Z = 2 （dimers）.The molecule is a dimer consisting of two Cp’ErCl species bridged by two Cl atoms. The centralmetal atom Er is coordinated to two Cp’ rings and two bridging chlorine atoms forming a pseudo-tetrahedron. All these complexes are soluble in THF, DME, EtO, toluene and hexane.