Bridging the Fields of Organometallic and Classical Coordination Chemistry: Localized and Delocalized Bonding in Polynuclear Complexes of (C5R5)(CO)2Mn

Abstract The capability of the title fragment to undergo efficient π back bonding, to exist in two kinetically stable neighboring oxidation states, and to exhibit a relatively small ligand field splitting have allowed the formation of unusual coordination compounds. Several mono- and polynuclear examples with an odd or even electron count and different degrees and direction of electron delocalization between ligand and metal fragment(s) will be discussed.