History
C.K. Jørgenson (Cologny-Geneva) described ligands as "innocent" and "suspect": "Ligands are innocent when they allow oxidation states of the central atoms to be defined. The simplest case of a suspect ligand is NO..."
Redox non-innocent ligands have been intensively investigated spectroscopically by the groups of K. Wieghardt (MPI Mülheim a/d Ruhr) and W. Kaim (Stuttgart) over the past years. Quite recently it became obvious that redox non-innocent ligands are not just a spectroscopic curiosity, as the radical reactivity of redox non-innocent ligands was demonstrated to play a crucial role in the mechanism of bio-catalytic processes mediated by several metallo-enzymes (e.g. Gallactose Oxidase, Cytochrome P450, methane mono-oxygenase). More recently, some synthetic research groups have started to systematically investigate the (catalytic) reactivity of transition metal complexes with redox non-innocent ligands in organometallic chemistry.
Read more about this topic: Non-innocent Ligand
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