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  • Title: Syntheses and structures of alkaline Earth-transition metal bimetallic complexes as heterogeneous hydrodechlorination catalyst precursors.
    Author: Ding E, Sturgeon MR, Rath A, Chen X, Keane MA, Shore SG.
    Journal: Inorg Chem; 2009 Jan 05; 48(1):325-30. PubMed ID: 19061345.
    Abstract:
    A series of alkaline earth-transition metal heterobimetallic complexes {(DMF)(x)M(mu-CN)(y)M*(CN)(4-y)}(infinity) [M = Ba: M* = Ni 1, M* = Pd 2, M* = Pt 3; M = Sr: M* = Ni 4, M* = Pd 5, M* = Pt 6; x = 3 or 4; y = 3 or 4] was prepared. Single-crystal X-ray diffraction analysis revealed that {(DMF)(4)Ba(mu-CN)(3)Ni(CN)}(infinity) 1, {(DMF)(4)Sr(mu-CN)(3)Ni(CN)}(infinity) 4, {(DMF)(4)Sr(mu-CN)(3)Pd(CN)}(infinity) 5, and {(DMF)(4)Sr(mu-CN)(3)Pt(CN)}(infinity) 6 form isostructural one-dimensional "ladder" arrays through isocyanide linkages (M-NC-M*), while {(DMF)(3)Ba(mu-CN)(4)Pd}(infinity) 2, and {(DMF)(3)Ba(mu-CN)(4)Pt}(infinity) 3 are two-dimensional puckered sheet like arrays. These bimetallic complexes can serve as effective precursors for the synthesis of supported bimetallic catalysts. It has been established that Ba-Pd/SiO(2) and Sr-Pd/SiO(2) catalysts, prepared from 2 and 5 loaded onto a silica support, delivered specific reaction rates in the hydrodechlorination of mono- and dichloro benzene that were over an order of magnitude greater than that achieved with conventional Pd/SiO(2).
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