NO Bridging Complexes

As described above, NO typically bonds to metal ions in an end-on fashion through nitrogen. However, bridging nitrosyl binuclear complexes are in fact quite common. When a NO ligand bridges two metal centers via the N-atom (i.e. in an / - -NO fashion), three different types of binding modes are possible  

The bridging NO ligand may be symmetric (A and B) or may be semi-bridging (C) in which the M-NO-M bond is asymmetric. The most widespread case of bimetallic complexes is with stracture A while a growing num- 

Some less common bonding modes are described below. 

In another case, Rh(Cp )Co2Cp 2(NO)2 (Cp = -pentamethylcyclopentadienyl), two NO ligands cap the triangular plane shaped by two cobalt and one rhodium metal atoms [71]. 

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I 2 Nitrogen Monoxide and Nitrous Oxide Binding and Reduction 2.2.1.4 -NO Bridging Complexes... 

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