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In the crystal structure of the title compound, [Mg(C4H8O)2(C9H7)2], the two indenyl ligands are bound to the Mg atom in a manner intermediate between η1- and η3-coordination; the latter is untypical, as it includes one of the ring-sharing C atoms. The O—Mg—O angle [101.01°] is larger than for any other magnesocene–(THF)2 adduct (THF is tetra­hydro­furan). A crystallographic C2 axis bisects the O—Mg—O angle.