Metal Carbonyls and Complexes of Other Monohapto L Ligands

Abstract

the columns of iron, cobalt and nickel (groups They are all the more stable as one goes down in the columns, because the strength of the metal-metal bond increases in this direction. The most current metal carbonyls are compiled in the table below. Reduction of all the neutral dinuclear metal carbonyls yields monoanionic mononuclear metal carbonyls such as [Mn(CO) 5)]-that are very stable, whereas reduction of mononuclear neutral metal carbonyls gives stable dianions such as Collman's reagent [Fe(CO) 4 ] 2-. Some trianions such as [Nb(CO) 5 ] 3-are known to be thermally stable and extremely air-sensitive. Ellis has synthesized a series of multi-anionic metal carbonyls under extreme conditions. 7.2 Anions of metal-carbonyl clusters are also known. Stable binary metal carbonyls