“…5a) is only observed for M(1) = Os, M(2) = Fe and the FeCp component is generally derived from a (substituted) ferrocenyl moiety. [24][25][26] In these 8 structures the Fe-centroid distances range from 1.619 to 1.662 Å, Fe-C(1) π bonds 1.952-2.010 Å and the Os(2)-C(1) σ bonds are only slightly longer at 2.042-2.076 Å. Also related to mode A are a series of compounds in which there is no direct metal-metal bond, 27 but these are not directly relevant to the discussion.…”