Octahedral and Cyclic [Ag6] Cluster Cores Stabilized by {Ag3(Spz)(3)(N-triphos)(3)} Motifs [ HSpz = Pyrazine-2-thiolate, N-triphos = Tris(( diphenylphosphanyl) methyl) amine]: Ag center dot center dot center dot Ag Interactions

摘要

The complexes [Ag-12(Spz)(12)(N-triphos)(2)][Ag-3(Spz)(3)(N-triphos)](2)center dot(DMF)(6) (1) and [Ag-18(Spz)(12)(N-triphos)(4)(CF3CO2)(6)] (2) were synthesized and structurally characterized by X-ray diffraction [HSpz = pyrazine-2-thiolate, N-triphos = tris((diphenylphosphanyl)methyl) amine]. The central [Ag-6] ring with chair-conformation in 1 and the ideally octahedral [Ag-6] cluster core in 2 are both stabilized by the tripodal building units of neutral [Ag-3(Spz)(3)(N-triphos)] compound. The Ag center dot center dot center dot Ag distances of the [Ag-6] moieties in 1 and 2 are 3.07 and 2.81 angstrom, respectively, exhibiting intermetallic interactions, which can enhance the stability of [Ag-6] conformations. In addition, the pi center dot center dot center dot pi interactions between parallel pyrazine rings could impose on the building and the Ag center dot center dot center dot Ag interactions of these Ag-S clusters.