Nitrosyl nitrido conversion

The mechanism for the nitrosyl — nitrido conversion could involve a butterfly cluster bridged across the open edge by NO, as found in the clusters [Os4H3(CO)i2(NO)] (47) (246) and [OsioC(CO)22(NO)]- (48)... 

The primary source of the nitrogen atoms in nitrido clusters is ultimately its monoxide, which is usually coordinated to a transition metal. Therefore, several of the methods used to form nitrido clusters are identical to methods used to form nitrosyl complexes. In this section the synthetic approaches are broken into three categories. The first involves the use of nitrosylating reagents such as NC, N02, or isolated metal nitrosyls themselves. The second category involves the conversion of a coordinated isocyanate into a nitrido cluster, and the last section discusses the interconversion of one nitrido cluster into another. Table III contains a list of the known nitrido clusters. 

The first observation of the formation of a nitrido ligand from a nitrosyl ligand involved the homonuclear Fe reaction shown in Eq. (51) (20, 42). There are numerous examples of reactions involving the conversion of a coordinated nitrosyl ligand into a nitrido cluster. In some cases [Eqs. (51) (20), (52) (91), and (53) (92, 93)], the NO is bound to a mononuclear... 

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