Crystal structure of bis­(η(5)-cyclo­penta­dien­yl)(2,3-di­ethyl­butane-1,4-di­yl)hafnium(IV)

The title compound, [Hf(C(5)H(5))(2)(C(8)H(16))], proves a structural motif of hafna­cyclo­pentane besides the coordination of two cyclo­penta­dienyl ligands in an η(5)-fashion. The hafna­cyclo­pentane ring has a twist conformation and is substituted by two ethyl groups in the β,β′-positions, which are trans orientated to each other. One cyclo­penta­dienyl ring and one ethyl group are each disordered over two positions with site-occupancy ratios of 0.679 (15):0.321 (15) and 0.702 (18):0.298 (18), respectively.