(C9H7)YbI(DME)2], the First Indenyl Half-Sandwich Complex of Divalent Ytterbium

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The reaction of the naphthalene ytterbium(II) complex (µ-C10H8)[YbI(DME)2]2 (1) with indene proved to be a convenient synthetic route to the novel indenyl half-sandwich ytterbium(II) complex [(C9H7)YbI(DME)2] (2), which is a monomer in the solid state and stable in DME solution, although it rearranges in THF to give the symmetric derivatives [(C9H7)2Yb(THF)2] and [YbI2(THF)2]. The reaction of 2 with equimolar amounts of C5H5Na in DME yields [(C5H5)2Yb(DME)] and [(C9H7)2Yb(DME)].