Synthesis and X-ray structures of trivalent lanthanide (+)-neomenthylcyclopentadienyl complexes

Abstract

Abstract Trivalent lanthanide (+)-neomenthylcyclopentadienyl complexes [CpR2Ln(μ-Cl)]2 (Ln=Sm (1), Yb (2), Y (3), Lu (4); CpR=(+)-neomenthylcyclopentadienyl)] and CpRLnX2(THF)3 [X=Cl, Ln=Sm (6), Gd (7), Yb (8), Y (9), Lu (10); X=I, Ln=Sm (11), Yb (12)) have been prepared by metathetical reactions of lanthanide halide with appropriate alkali-metal (+)-neomenthylcyclopentadienyl complexes. X-ray structural analysis has revealed that compounds 1 and 3 are chloro-bridged dimers with the asymmetric plane described by Ln2Cl2 almost perpendicular to the plane described by the four cyclopentadienyl ring centroids. The monomeric compound CpRLnI2(THF)3 (11) adopts a pseudo-octahedral geometry with the two iodine atoms taking the trans-positions.