Übergangsmetall-Fulven-Komplexe: XXXII. Heteronukleare Zweikernkomplexe des Azulens

The molecular structure of the dinuclear complex (η⁶-benzene)M$\text{o(μ-η}{}^6\text{: η}{}^4\text{-azulene)C}$r(CO)₃ was determined by an X-ray diffraction study. The reaction of (η⁶-azulene)(η⁶-benzene)Mo] with RhCI(CO)₂]₂ gives the salt η⁶-benzene)M$\text{o(μ-η}{}^6\text{: η}{}^4\text{-azulene)R}$h(CO)₂]₊RhCl₂(CO)₂]^?, the structure of which was also characterized by X-ray crystallography. The cation of this salt can also be synthesized from (η⁶-azulene)(η⁶-benzene)Mo] and Rh(CO)₂]⁺. The fluxionality of the cation was studied by temperature-dependent ¹H-NMR measurements. The complex (η⁶-azulene)(η⁶-benzene)Mo] reacts with Fe₂(CO)₉ to give the dinuclear complex (η⁶-benzene)M$\text{o(μ-η}{}^5\text{:}{}_3\text{-azulene)F}$e(CO)₃], as confirmed by X-ray diffraction.