Synthesis of the Early Lanthanide ComplexesLi(DME)3MeCpLn(NPh2)3(Ln=La,Pr,Nd)and X-Ray Crystal Structure of La Complex

摘要

The reaction of MeCpLnCl·2LiCl·nTHF with 2 equivalent of LiNPh2 in THF,hexane andtoluene mixture solution gives the new complex[Li（DME）2][（η5-MeCp）Ln（NPh2）3]（Ln=La,Pr,Nd）byextraction with DME.They have been characterized by elemental analysis,IR and NMR.The La complexcrystallizes in the monoclinic space group P21/c with α=1.8335（6）nm,b=1.6576（5）nm,c=1.7461（6）nm,β=96.04°,V=5.277 nm2,Z=4,Dc=1.26g·cm-3,R=0.057 and Rw=0.048（1≥2.5σ（Io））for 3378 reflec-tions.The complex consists of a pair of a cation and an anion.La3+ is coordinated by onemethylcyclopentadienyl and three diphenylamidos to form six-coordinate pseudotetrahedron with the meanLn-N and La-C（ring）distances of 0.2459（8）and 0.2843（11）nm,respectively.