Abstract
The μ-ethylidene complex (μ-CHCH 3)[(η 5-C 5Me 5)Co(μ-CO)] 2 (Me CH 3) accessible along the diazoalkane route from [(η 5-C 5Me 5)Co(μ-CO)] 2 and diazoethane exhibits both in solution (IR spectroscopy) and in the crystalline state (X-Ray diffraction) a nearly C s -symmetrical structure with a triply bridged metal—metal bond. This compound thus differs from the parent μ-methylene complex of analogous composition, which latter compound exists as a mixture of the isomers A and B with terminal and edge-bridging carbonyl ligands, respectively (IR spectra, X-Ray diffraction). A structural comparison with closely related alkylidene- and carbonyl-bridged derivatives reveals a striking lack of correlation between metal—metal bond lengths and formal bond orders as they result from the EAN rule.
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