title: New dinuclear nickel(II) complexes: synthesis, structure, electrochemical, and magnetic properties.
abstract: The reaction of [NiBr(2)(bpy)(2)] (bpy = 2,2'-bipyridine) with organic phosphinic acids ArP(O)(OH)H [Ar = Ph, 2,4,6-trimethylphenyl (Mes), 9-anthryl (Ant)] leads to the formation of binuclear nickel(II) complexes with bridging ArP(H)O(2)(-) ligands. Crystal structures of the binuclear complexes [Ni(2)(μ-O(2)P(H)Ar)(2)(bpy)(4)]Br(2) (Ar = Ph, Mes, Ant) have been determined. In each structure, the metal ions have distorted octahedral coordination and are doubly bridged by two arylphosphinato ligands. Magnetic susceptibility measurements have shown that these complexes display strong antiferromagnetic coupling between the two nickel atoms at low temperatures, apparently similar to binuclear nickel(II) complexes with bridging carboxylato ligands. Cyclic voltammetry and in situ EPR spectroelectrochemistry show that these complexes can be electrochemically reduced and oxidized with the formation of Ni(I),Ni(0)/Ni(III) derivatives.
authors.affiliation: A.E. Arbuzov Institute of Organic and Physical Chemistry of the Russian Academy of Sciences, Arbuzov Street 8, Kazan 420088, Russian Federation. yakhvar@iopc.ru
authors.forename: Dmitry
authors.initials: D
authors.lastname: Yakhvarov
authors.forename: Ekaterina
authors.initials: E
authors.lastname: Trofimova
authors.forename: Oleg
authors.initials: O
authors.lastname: Sinyashin
authors.forename: Olga
authors.initials: O
authors.lastname: Kataeva
authors.forename: Yulia
authors.initials: Y
authors.lastname: Budnikova
authors.forename: Peter
authors.initials: P
authors.lastname: Lönnecke
authors.forename: Evamarie
authors.initials: E
authors.lastname: Hey-Hawkins
authors.forename: Andreas
authors.initials: A
authors.lastname: Petr
authors.forename: Yulia
authors.initials: Y
authors.lastname: Krupskaya
authors.forename: Vladislav
authors.initials: V
authors.lastname: Kataev
authors.forename: Rüdiger
authors.initials: R
authors.lastname: Klingeler
authors.forename: Bernd
authors.initials: B
authors.lastname: Büchner