Syntheses and crystal structures of ferrocene substituted indenyl complexes

From the reaction of FeCl2 with the ligand [C5H4CMe2C9H7]−, where a cyclopentadienyl and an indene unit are linked by a methylene like bridge, the new complex [{η5-C5H4CMe2(C9H7)}2Fe] (1) was obtained. This compound was deprotonated and reacted with [(cod)RhCl]2 (cod: 1,5-cyclooctadiene) to give the two new heterobimetallic complexes [(η5-C5H4CMe2C9H7)Fe(η5-C5H4CMe2-η5-C9H6)Rh(cod)] (2) and [Fe{(η5-C5H4CMe2-η5-C9H6)Rh(cod)}2] (3). The related species [(η5-C5H4CMe2C9H7)Fe(η5-Cp)] (4) and [CpFe(η5-C5H4CMe2-η5-C9H6)Rh(cod)] (5) were synthesized by the reaction of lithioferrocene with dimethylbenzofulvene and [(cod)RhCl]2 in the latter case. [(η5-C9H6CMe2C4H9)Rh(cod)] (6) and [(η5-C9H6CCH2Me)Rh(cod)] (7) are side products in the last reaction. All new compounds were characterized by MS and NMR. Single crystals of 4, 5 and [(η5-C5H4CMe2-η5-C9H6)Rh2(cod)2] (8) were characterized by X-ray analysis.