Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume -, Issue 3, Pages 343-348Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201101359
Keywords
Cyanides; Non-innocent ligands; Organometallic chemistry; Oxido ligands
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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+/center dot/- and O-2(0/center dot-/2-) systems via the classical 1,4-dihetero-1,3-diene chelates (e. g. alpha-diimine, dithiolene, or o-quinone redox series) to pi-conjugated macrocycles. The increased attention paid recently to the redox activity of ligands in coordination chemistry has now prompted wider successful searches, resulting in the establishing of less-conventional examples such as cyanide, carbon monoxide, thioethers, or acetylacetonate derivatives as non-innocently behaving ligands. By considering situations with significantly covalent metal-ligand bonding, the cases of metal-oxo, metal-hydrido, and organometallic compounds 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.
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