#epsilon#-Caprolactam as a Donor Ligand for Lanthanide Halides:Formation of Cationic [Ln(C_6H_(11)NO)_6Cl]~(2+) and [Ln(C_6H_(11)NO)_4 Cl_2]~+ Complexes

摘要

Examination of the coordination chemsitry of #epsilon#-caprolactam with lanthanide trichlorides reveals that cationic #epsilon#-caprolactam-solvated complexes of two types can be obtained from acetonitrile depending on the size of the metal.The larger lanthanides Ce,Nd,Pr,and Sm form capped octahedral dications,[Ln9C_6H_(11)NO)_6Cl]~(+2 ),with the chloride ligand in the capping position.The smaller metals Eu,Gd,and Ho form trans-ocatahedral monocations [Ln(C_6H_(11)NO)_4 Cl_2]~+.Chloride ions are the counteranios in both cases.