Crystal structures of titanium–aluminium and –gallium complexes bearing two μ(2)-CH(3) units

The isotypic crystal structures of two titanocene complexes containing an EMe(3) unit (E = Al, Ga; Me = meth­yl) with two μ (2)-coordinating methyl groups, namely [μ-1(η(5))-(adamantan-1-yl-2κC (1))cycylo­penta­dien­yl]di-μ(2)-methyl-methyl-2κC-[1(η(5))-penta­methyl­cyclo­penta­dien­yl]aluminiumtitanium(III), [AlTi(CH(3))(3)(C(10)H(15))(C(15)H(18))], and [μ-1(η(5))-(adamantan-1-yl-2κC (1))cycylo­penta­dien­yl]di-μ(2)-methyl-methyl-2κC-[1(η(5))-penta­methyl­cyclo­penta­dien­yl]galliumtitanium(III), [GaTi(CH(3))(3)(C(10)H(15))(C(15)H(18))], are reported. Reacting a dinuclear nitro­gen-bridged low-valent titanium(III) complex with the Lewis acids AlMe(3) or GaMe(3) results in the loss of mol­ecular di­nitro­gen and the formation of two monomeric titanocene(III) fragments bearing two μ (2)-bridging methyl groups. Single crystal X-ray diffraction reveals the formation of a new E—C bond involving the penta­fulvene ligand while the bridging and terminal methyl groups remain intact.