Tetracarbonyl(η^2:2-1,5-cyclooctadiene)molybdenum(0)

In the title compound, tetracarbonyl[(1,2,5,6-η)-1,5-cyclooctadiene]molybdenum(0), [Mo(C₈H₁₂)(CO)₄], the coordination polyhedron around the metal atom is a distorted octahedron. The Mo–C bond distance for CO groups trans to a C=C unit is significantly shortened [average value 1.948 (8) Å] while the Mo–C bond distances for the cis groups are only slightly shortened [average value 2.031 (8) Å], compared with the values reported for [Mo(CO)₆]. The average distance of the Mo atom to the midpoints of the olefinic C=C bonds is 2.388 (8) Å.

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