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本文用Fe_3(μ_3-Te)_2(CO)_9同Mo_2(CO)_6(η~5-C_5H_5)_2反应合成出标题化合物。结晶学参数如下:空间群Imm2,620个I≥2σ(I)的独立衍射参加最小二乘法修正结构,最终R因子值为0.022。X射线分析表明Mo_2Fe_2形成一蝴蝶型结构,其中两钼原子占据两蝴蝶翼的交界处,Mo—Mo=2.819。两个铁则处于蝴蝶翼的顶端,Mo—Fe=2.932(2)。每个钼原子与一个环成二烯基键联,三个羰基配体以端基的形式与每个铁原子键联。一碲原子处在蝴蝶型开口的上方键联四个金属原子,Mo—Te(μ_4)=2.625(2),Fe—Te(μ_4)=2.713(2)。两个μ_3-碲原子处在μ_4-Te原子的对面,分别处在二个FeMo_2三角面上,Mo—Te(μ_3)=2.678(1),Fe—Te(μ_3)=2.513(3)。整个分子具有严格的C_2v对称性,整个簇骼结构可看成双帽三角双锥构型。
The title compound was prepared by the reaction of Fe_3 (μ_3-Te) _2 (CO) _9 with Mo_2 (CO) _6 (η ~ 5-C_5H_5) _2. The crystallographic parameters are as follows: The space group Imm2,620 independent diffraction with I≥2σ (I) participates in the least squares correction structure, and the final R factor is 0.022. X-ray analysis showed that Mo 2 Fe 2 formed a butterfly structure in which two molybdenum atoms occupy the junction of two butterfly wings with Mo-Mo = 2.819. Two irons are at the top of the butterfly wing, Mo-Fe = 2.932 (2). Each molybdenum atom is bonded to one ring of a dienyl group, and three carbonyl ligands are bonded to each iron atom in terminal form. A tellurium atom bonds four metal atoms above the butterfly-shaped opening with Mo-Te (μ_4) = 2.625 (2) and Fe-Te (μ_4) = 2.713 (2). The two μ_3-tellurium atoms are located on the opposite side of μ_4-Te atom, and they are located on two FeMo_2 triangular faces respectively. The Mo_Te (μ_3) = 2.678 (1) and Fe_Te (μ_3) = 2.513 (3). The entire molecule has a strict C_2v symmetry, the entire cluster structure can be seen as double-hat triangular double cone configuration.