Synthesis, molecular structure, and catalytic activity of borohydride complexes [(Me3Si)2NC(NPr~i)2]2Nd(BH4)2Li(thf)_2 and [(Me3Si)2NC(NPr~i)2]2Sm(BH4)2Li(thf)_2

摘要

The reactions of lanthanide tris(borohydrides) Ln(BH4)3(thf)3 (Ln = Sm or Nd) with 2 equiv. of lithium N,N'-diisopropyl-N'-bis(trimethylsilyl)guanidinate in toluene produced the [(Me3Si)2NC(NPr~i)2]Ln(BH4)2Li(thf)2 complexes (Ln = Sm or Nd), which were isolated in 57 and 42% yields, respectively, by recrystallization from hexane. X-ray diffraction experiments and NMR and IR spectroscopic studies demonstrated that the reactions afford mono-meric ate complexes, in which the lanthanide and lithium atoms are linked to each other by two bridging borohydride groups. The complexes exhibit catalytic activity in polymerization of methyl methacrylate.