Abstract
A review; this essay for EurJIC's cluster issue on cooperative and redox non-innocent ligands introduces the reader to redox-active ligands, which range from the small archetypical NO+/·/- and O20/·-/2- systems via the classical 1,4-dihetero-1,3-diene chelates (e.g. a-diimine, dithiolene, or o-quinone redox series) to p-conjugated macrocycles. The increased attention paid recently to the redox activity of ligands in coordination chem. has now prompted wider successful searches, resulting in the establishing of less-conventional examples such as cyanide, carbon monoxide, thioethers, or acetylacetonate derivs. as non-innocently behaving ligands. By considering situations with significantly covalent metal-ligand bonding, the cases of metal-oxo, metal-hydrido, and organometallic compds. will also be addressed, with a perspective on how pervasive non-innocent ligand behavior is. The materials and reactivity potential of redox-active ligands will be pointed out. on SciFinder(R)
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