title: Distorted commo-Cobaltacarboranes Based on the 5,6-Dicarba-nido-decaborane(12): The First Bimetal Cobalt-Copper Zwitterion-Containing Cluster with Four (B-H)4···Cu Bonds Not Showing Fluxional Behavior in Solution.
abstract: Treatment of a recently reported complex [Ph4P][closo,nido-CoH(2,4-C2B8H10)(7,8-C2B8H11)] (1) either by H2O2in acetone or NaH in THF leads to the loss of both the bridging and terminal hydrides yielding the diamagnetic salt of an anionic commo-cobaltacarborane [Ph4P][Co(2,4-isonido-C2B8H10)2] (2) with the {CoC2B8}-cluster units adopting a distorted skeletal geometry of the isonido-type. The anionic commo complex 2 reacts with in situ generated cationic [CuPPh3]+species to give stable copper-cobalt zwitterion [Ph3PCu][Co(2,4-isonido-C2B8H10)2] (3) with four two-electron, three-center (B-H)4···Cu bonds, and exhibits no fluxional behavior in solution. Complex 3, at the same time, in CH2Cl2in the presence of 2-fold excess of PPh3readily converts to a new anionic species [(Ph3P)3Cu][Co(2,4-isonido-C2B8H10)2] (4) which retains initial isonido geometry. All newly obtained diamagnetic commo complexes were characterized by a combination of analytical and multinuclear NMR spectroscopic data and by single-crystal X-ray diffraction studies of complexes 2 and 3.
authors.affiliation: A. N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences , 28 Vavilova Street, 119991 Moscow, Russian Federation.
authors.forename: Elena V
authors.initials: EV
authors.lastname: Balagurova
authors.affiliation: A. N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences , 28 Vavilova Street, 119991 Moscow, Russian Federation.
authors.forename: Irina V
authors.initials: IV
authors.lastname: Pisareva
authors.affiliation: A. N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences , 28 Vavilova Street, 119991 Moscow, Russian Federation.
authors.forename: Alexander F
authors.initials: AF
authors.lastname: Smol'yakov
authors.affiliation: A. N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences , 28 Vavilova Street, 119991 Moscow, Russian Federation.
authors.forename: Fedor M
authors.initials: FM
authors.lastname: Dolgushin
authors.affiliation: A. N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences , 28 Vavilova Street, 119991 Moscow, Russian Federation.
authors.forename: Ivan A
authors.initials: IA
authors.lastname: Godovikov
authors.affiliation: A. N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences , 28 Vavilova Street, 119991 Moscow, Russian Federation.
authors.forename: Igor T
authors.initials: IT
authors.lastname: Chizhevsky