Synthesis and structure of [Sm(η5-CpPPh2)(κ3-TpMe2)(I)(THF)]; a samarium complex with four different ligands

Abstract The mixed-ligand complex, [Sm(CpPPh 2 )(Tp Me2 )(I)(THF)] ( 1 ), was prepared in moderate yield (55%) by the redox reaction between SmI 2 and Tl[CpPPh 2 ] in THF at ambient temperature followed by direct treatment with KTp Me2 . Complex 1 was fully characterized by elemental analysis, FT-IR, MS and multinuclear NMR ( 1 H, 11 B and 31 P) spectroscopies. The solid-state structure was established by single crystal X-ray crystallography. The coordination geometry of the samarium is best described as distorted tetrahedral with the apexes occupied by four different ligands; Tp Me2 , CpPPh 2 , I − and THF. Variable temperature 1 H-NMR spectroscopic investigation confirmed that the chiral, asymmetric structure is maintained in solution at low temperatures.