Crystal structure of bis­(μ2-meth­anolato-κO:κO)hexa­methyl­bis­(μ2-tri­phenyl­acetato-κO:κO′)bis­(μ2-tri­phenyl­acetato-κ2O,O′:κO)dialuminiumdi­lanthanum toluene tetra­solvate

摘要

The title compound, [Al2La2(C20H15O2)4(CH3)6(CH3O)2]·4CH3C6H5 or [{La(Ph3CCOO)2(Me3AlOMe)}2]·4CH3C6H5, was formed in a reaction between lanthanum tris­(tetra­methyl­aluminate) and tri­phenyl­acetic acid (1:1) with unintended partial oxidation. The tri­phenyl­acetate ligand exhibits μ2-κ1O:κ1O′ bridging and μ2-κ2O,O′:κ1O semi-bridging coordination modes, forming a dimeric La2(μ-OCO)4 core. The semi-bridging tri­phenyl­acetate group provides additional bonding with an La3+ cation via the π-system of one of its phenyl rings. The tri­methyl­meth­oxy­aluminate anion, which is coordinated to the La3+ cation by its O atom, displays a rather long La—CMe bond. Two toluene mol­ecules are each disordered over two orientations about centres of symmetry with site occupancy factors of 0.5. The title compound represents the first example of an LnIII complex containing both alkyl alkoxide aluminate and π-bounded arene fragments.