Crystal structure of the tetra-meth-yl(pheneth-yl)cyclo-penta-dienylmolybdenumtricarbonyl dimer.

The structure of the dimer bis-{tricarbon-yl[η-tetra-meth-yl(pheneth-yl)cyclo-penta-dien-yl]molybdenum}(-), [Mo(CH)(CO)], at 102 K has triclinic ( ) symmetry. The reaction between tetra-meth-yl(pheneth-yl)cyclo-penta-diene and molybdenum hexa-carbonyl in refluxing xylenes for 18 h led to a 56% yield of the dimer as a red solid. The asymmetric unit of the structure is the tetra-meth-yl(pheneth-yl)cyclo-penta-dienylmolybdenumtricarbonyl moiety and the entire dimeric mol-ecule is generated by inversion symmetry. The Mo-Mo bond length is 3.2773 (3) Å, a value slightly above the mean value for all [CpMo(CO)] compounds listed in the CSD and slightly below the mean for [Cp*Mo(CO)] complexes.