Inverse cycloheptatrienyl sandwich complexes of uranium and neodymium

Abstract

Reaction of UX₄ (X = NEt₂ or BH₄) with K[C₇H₉] afforded the anionic complexes K[X₃U(µ-η⁷∶η⁷ -C₇H₇)UX₃] whereas treatment of [Nd(BH₄)₃(thf )₂] (thf = tetrahydrofuran) with K[C₇H₉] gave the neutral compound [(thf )(BH₄)₂Nd(µ-η⁷ ∶η⁷-C₇H₇)Nd(BH₄ )(thf )₂]. The formation of the cycloheptatrienyl ligand resulted from the disproportionation reaction 3 C₇H₉^- → C ₇H₇^3- + 2 C₇H₁₀. The crystal structure of [(thf )(BH₄)₂Nd(µ-η⁷ ∶η⁷-C₇H₇)Nd(BH₄ )(thf )₃], the first cycloheptatrienyl compound of a 4f element, has been determined.

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