text: *Nitrosyl (NO) binds to metals in one of two extreme geometries - bent where NO is treated as a pseudohalide (NO), and linear, where NO is treated as NO.  
  *Dioxygen can be non-innocent, since it exists in two oxidation states, superoxide (O) and peroxide (O).
  Ligands with extended pi-delocalization such as porphyrins, phthalocyanines, and corroles and ligands with the generalised formulas [D-CR=CR-D] (D = O, S, NR’ and R, R' = alkyl or aryl) are often non-innocent.  In contrast, [D-CR=CR-CR=D] such as NacNac or acac are innocent.  
  *catecholates and related 1,2-dioxalenes.
  *dithiolenes, such as maleonitriledithiolate (see example of [Ni(SCPh)] above).
  *1,2-diimines such as derivatives of 1,2-diamidobenzene, 2,2-bipyridine, and dimethylglyoxime.  The complex Cr(2,2-bipyridine) is a derivative of Cr(III) bound to three bipyridine ligands.  On the other hand, one-electron oxidation of [[Ruthenium tris(bipyridine) chloride|Ru(2,2'-bipyridine)]] is localized on Ru and the bipyridine is behaving as a normal, innocent ligand in this case.
  *ligands containing ferrocene can have oxidation events centered on the ferrocene iron center rather than the catalytically active metal center.
  *pyridine-2,6-diimine ligands can be reduced by one and two electrons.