Syntheses of (C5H9C5H4)2 LnCl(THF)n and Crystal Structures of [(C5H9C5H4)2SmCl(THF)]2 and [(C5H9C5H4)2ErCl]2

Since 1980, organolanthanide chemistry of substituted cyclopentadienyl has been rapidly developed. Many substituted cyclopentadienyl lanthanoid chloride complexes have been synthesized. These sterically bulky ligands, such as-CMe, -(MeSi)CH,-t-BuCp, etc., can stabilize the complexes with low coordination number, especially the complexes of mono-and bin(substituted cyclopentadienyl) lanthanoid chloride. Using cyclopentylcyclopentadienyl as ligand, we synthesized Cp~′ LnCl(THF)(Cp′=cyclopentylcyclopentadienyl, CHCH, Ln=Nd, Sm, n=1; Ln=Er, Yb, n=0). Because the ligand is sterically bulky, it can not only prevent the disproportionation but also increase the solubil-