title: Chemically reversible four-electron oxidation and reduction utilizing two inorganic functional groups.
abstract: Four-electron oxidation of the quadruply bonded W(2)(II,II) compound W(2)(2,2'-dipyridylamide)(4), 1, results in the formation of a novel, diamagnetic ditungsten terminal oxo compound [W(2)O(2,2'-dipyridylamide)(4)](2+), 2. In contrast to the chemical inertness of mononuclear tungsten oxo species, 2 undergoes a four-electron reduction including oxygen-atom transfer in reactions with excess tri-tert-butylphosphine in acetonitrile to recover 1. This unusual chemically reversible multielectron reactivity is ascribed to the cooperation of W-O and W-W multiple bonding.
authors.affiliation: Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA.
authors.forename: Michael
authors.initials: M
authors.lastname: Nippe
authors.forename: Samuel M
authors.initials: SM
authors.lastname: Goodman
authors.forename: Charles G
authors.initials: CG
authors.lastname: Fry
authors.forename: John F
authors.initials: JF
authors.lastname: Berry
mesh_terms: D015082:2,2'-Dipyridyl / Q000031:analogs & derivatives*; D000577:Amides / Q000737:chemistry; D018360:Crystallography, X-Ray; D008958:Models, Molecular; D010084:Oxidation-Reduction; D017973:Tungsten Compounds / Q000737:chemistry*
chemical_list: D000577:Amides; D017973:Tungsten Compounds; D015082:2,2'-Dipyridyl