title: Bridging mu-eta(5):eta(4)-coordination of an indenyl ligand and reductive coupling of diazabutadienes in the assembly of di- and tetranuclear mixed-valent ytterbium indenyldiazabutadiene complexes.
abstract: The redox reaction of [Yb(C(9)H(7))(2)(thf)(2)] with the diazabutadiene PhN==C(Me)--C(Me)==NPh (DAD) has been found to depend on the molar ratio of the reactants. Reaction in a 1:2 molar ratio affords the dinuclear mixed-valent complex [Yb(2)(mu-eta(5):eta(4)-C(9)H(7))(eta(5)-C(9)H(7))(2){mu-eta(4):eta(4)-PhNC(Me)==C(Me)NPh}] containing an indenyl ligand with an unusual mu-eta(5):eta(4) bridging coordination. Reaction of equimolar amounts of these compounds results in an organolanthanide-mediated reductive coupling of the DAD ligands and formation of the tetranuclear mixed-valent complex [Yb(2)(mu-eta(5):eta(4)-C(9)H(7))(eta(5)-C(9)H(7))(2){mu-eta(4):eta(4)-PhNC(CH(2))==C(Me)NPh}](2) with a novel tetradentate tetraimine ligand.
authors.affiliation: G. A. Razuvaev Institute of Organometallic Chemistry of the Russian Academy of Sciences, Tropinia 49, 603600 Nizhny Novgorod GSP-445, Russia. trif@imoc.sinn.ru
authors.forename: Alexander A
authors.initials: AA
authors.lastname: Trifonov
authors.forename: Elena A
authors.initials: EA
authors.lastname: Fedorova
authors.forename: Georgy K
authors.initials: GK
authors.lastname: Fukin
authors.forename: Evgenii V
authors.initials: EV
authors.lastname: Baranov
authors.forename: Nikolai O
authors.initials: NO
authors.lastname: Druzhkov
authors.forename: Mikhail N
authors.initials: MN
authors.lastname: Bochkarev