Abstract
The title salt, [Pd(C3H4N2)4]Cl2, was obtained unexpectedly by the reaction of palladium(II) dichloride with equimolar amounts of 1-chloro-1-nitro-2,2,2-tris-(pyrazol-yl)ethane in methanol solution. The Pd(2+) cation is located on an inversion centre and has a square-planar coordination sphere defined by four N atoms of four neutral pyrazole ligands. The average Pd-N distance is 2.000 (2) Å. The two chloride anions are not coordinating to Pd(2+). They are connected to the complex cations through N-H⋯Cl hydrogen bonds. In addition, C-H⋯Cl hydrogen bonds are observed, leading to a three-dimensional linkage of cations and anions.
Highlights
The title salt, [Pd(C3H4N2)4]Cl2, was obtained unexpectedly by the reaction of palladium(II) dichloride with equimolar amounts of 1-chloro-1-nitro-2,2,2tris(pyrazolyl)ethane in methanol solution
The Pd2+ cation is located on an inversion centre and has a square-planar coordination sphere defined by four N
In the course of an investigation on the coordination chemistry of various azolyl-nitrochloroalkanes (Zapol’skii & Kaufmann, 2008), we have previously studied the reaction of copper(II)
Summary
Transition metal complexes containing pyrazole or substituted pyrazoles as ligands are of current interest due to their supramolecular arrangements (Lumme et al, 1988; Takahashi et al, 2006; Casarin et al, 2007; Alsalme et al, 2013). Perchlorate hexahydrate with equimolar amounts of 1-chloro1-nitro-2,2,2-tris(pyrazolyl)ethane, Cl(NO2)CH—C(C3H3N2). The formation of free pyrazole could only be explained by a solvolytic degradation of the starting material. This degradation must have taken place to a large extent as the isolated yield was 64% (Edelmann et al, 2008). Structure diagram of the starting material 1-chloro-1-nitro-2,2,2-tris(pyrazolyl)ethane. We have carried out a closely related reaction of 1chloro-1-nitro-2,2,2-tris(pyrazolyl)ethane with palladium(II). An elemental analysis of the title compound was in very good agreement with the composition C12H16Cl2PdN8. In this case, too, the yield was fairly high (56%), indicating a far-reaching decomposition of the starting material. The ligand degradation of azolyl-nitrochloroalkanes in the presence of transition metal salts is a more common phenomenon than originally anticipated
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