A long wait: Of the C2v, D3d and D2d isomers of [Co2(CO)8], the D2d isomer has eluded isolation and structural characterization for 50 years. A “D2d‐type” isomer is also missing for the vast number of structurally characterized [Co2(CO)8−nLn] derivatives. The wait is over, as the bis‐m‐terphenyl isocyanide complex [1,1‐Co2(CO)6(CNAr Mes 2)2] is shown to serve as a structural mimic of the D2d form of [Co2(CO)8].
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