Bis(eta 5-isopropyltetramethylcyclopentadienyl)(tetrahydroborato-kappa 3 H,H',H")(tetrahydrofuran-O)-samarium(III): a lanthanidocene complex with a tridentate tetrahydroborato ligand

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The lanthanidocene complex [Sm(BH4)(C12H19)2(C4H8O)], (I), shows a distorted tetrahedral arrangement around the central SmIII atom. It consists of two η5-isopropyltetramethylcyclopentadienyl ligands, one tetrahydroborato (BH4−) ligand bridging via H atoms to the lanthanide atom and one coordinating tetrahydrofuran (thf) molecule. The BH4− unit of (I) coordinates as a tridentate ligand with three bridging H atoms and one terminal H atom [Sm—B—H4 176 (2)°]. The η5-isopropyl­tetra­methylcyclopentadienyl ligands of this bent-sandwich complex [Cp1—Sm—Cp2 133.53 (1)° where Cp denotes the centroid of the cyclopentadienyl ring] adopt staggered conformations.