Syntheses of (C 5 H 9 C 5 H 4 ) 2 LnCl(THF) n (Ln = Nd, Sm, Er, Yb) and crystal structure of [(C 5 H 9 C 5 H 4 ) 2 ‐LnCl(THF) n ] 2 (Ln = Sm, n = 1; Ln = Er, n = 0)

Reactions of lanthanoid trichlorides with sodium cyclopentylcyclopentadienyl in THF afford bis(cyclopentylcyclopentadienyl)lanthanoid chloride complexes (C 2 H 9 C 5 H 4 ) 2 LnCl(THF) n (Ln = Nd, Sm, n = 1; Ln = Er, Yb, n = 0). The compound [Cp' 2 SmCl(THF)] 2 (2) (Cp' = cyclopentylcyclopentadienyl) crystallizes from mixed solvent of hexane and THF in monoclinic space group P 2 1 / c with a = 11.583 (3), b = 23.019(6), c = 8.227 (2) Å, β = 90.26 (2)°, V = 2194 (1)Å 2 , D c = 1.59 g / cm 3 , μ = 28.6 cm −1 , F (000) = 1060, Z = 2 (dimers). Its crystal molecule is a dimer with a crystallographic symmetry center. The central metal atom Sm is coordinated to two Cp' rings, two bridging chlorine atoms and one THF forming a distorted trigonal bipyramid. The crystal of [Cp' 2 ErCl] 3 (3) belongs to the triclinic space group P 1 with a = 11.264 (2), b = 13.296(5), c = 14.296(6)Å, α = 96.99 (3), β = 112.47(2), γ = 102.78(2)°, V = 1865(1)Å 2 , D e = 1.67 g / cm 2 , μ = 48.0 cm −1 , F (000) = 924, Z = 2 (dimers). The molecule is a dimer consisting of two Cp' 2 ErCl species bridged by two Cl atoms. The central metal atom Er is coordinated to two Cp' rings and two bridging chlorine atoms forming a pseudotetrahedron. All these complexes are soluble in THF, DME, Et 2 O, toluene and hexane.