Clusters double cube

Electrochemical studies of the mixed metal cuboidal clusters revealed that, like [Mo4S4(H20)i2] +, they could be reversibly reduced and oxidized in one-electron steps. The comer-shared double cube [Mo7S8(H20)ig] + is described in the Section 7.3.5. 

One remarkable derivative of these cube-like clusters was isolated with compound 9, in which one vertex of the Alx cube remained unoccupied [18]. It was obtained by a reaction similar to Eq. (2), however, a slightly better steric shielding was achieved by ethyl groups instead of methyl substituents attached to aluminum [Eq. (5)]. Orange-red crystals of 9 were isolated in 36% yield. It may be described as the product of an incomplete hydroalumination reaction and contains seven aluminum atoms, a hydrogen atom bridging only three metal atoms and two alkenyl groups with C=C double bonds that are located at the open face of the cluster. As... 

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