Crystal structure of bis-[(η--butyl-cyclo-pentadien-yl)tri-carbonyl-molybdenum(I)](-).

The dinuclear mol-ecule of the title compound, [Mo(CH)(CO)] or [Mo( BuCp)(CO)] where Bu and Cp are -butyl and cyclo-penta-dienyl, is centrosymmetric and is characterized by an Mo-Mo bond length of 3.2323 (3) Å. Imposed by inversion symmetry, the BuCp and the carbonyl ligands are in a arrangement to each other.