 There are two kinds of CO ligands; one CO on each Mn is coaxial with the Mn-Mn bond (293 pm), and four on each manganese that are perpendicular to it (equatorial).In the stable rotamer, the two Mn(CO)5 subunits are staggered.The overall molecule thus belongs to the point group D4d, which is an uncommon symmetry shared with S2F10.