Manganese carbonyl derivatives halogenation

The cationic manganese carbonyl derivative Mn(CO)4(phen)+ has been isolated as the Co(CO)4 and Mn(CO)5 salts (445) and the technetium derivatives Tc(CO)s(phen)X are also known. The color is a function of the halogen X, changing from colorless (X = Cl), through bright brown (X = Br), to brown (X = I) (374). The reaction of bipyridyl with pentacarbonyliron induces disproportionation (375) this can also occur when bis(l,3-cyclohexadiene)tetracarbonyldicobalt is the reactant. However, [L2(CO)4Co2] has been prepared 62). 

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