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Unexpected formation and crystal structure of tetra-kis-(1H-pyrazole-κN (2))-palladium(II) dichloride.

Wagner T, Christiansen N, Hrib CG, Kaufmann DE, Edelmann FT - Acta Crystallogr Sect E Struct Rep Online (2014)

Bottom Line: 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.

View Article: PubMed Central - HTML - PubMed

Affiliation: Chemisches Institut, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, D-39106 Magdeburg, Germany.

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.

No MeSH data available.


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The coordination sphere of Pd2+ and the Cl− counter-ions in the title compound. Displacement ellipsoids represent the 50% probability level. [Symmetry code (A): −x + , −y + , −z.]
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fig2: The coordination sphere of Pd2+ and the Cl− counter-ions in the title compound. Displacement ellipsoids represent the 50% probability level. [Symmetry code (A): −x + , −y + , −z.]

Mentions: In the crystal structure of the title compound, the Pd2+ ion is located on an inversion centre and is bonded to four neutral pyrazole ligands within a square-planar coordination environment (Fig. 2 ▶). The average Pd—N distance in the [Pd(pyrazole)4]2+ cation is 2.000 (2) Å. This is exactly the same value as found for the Cu—N distance in trans-bis­(perchlorato)-tetra­kis­(pyrazole)­copper(II) [2.000 (1) Å; Edelmann et al., 2008 ▶]. The two chloride anions are not coordinating to the Pd2+ cation. This is in marked contrast to the analogous copper(II) complex [Cu(pyrazole)4Cl2] (Xing et al., 2006 ▶), in which the Cu2+ ion is six-coordinated by four N atoms from four pyrazole ligands and two Cl− ions. The same octa­hedral coordination has also been reported for the manganese(II) analog [Mn(pyrazole)4Cl2] (Lumme, 1985 ▶).


Unexpected formation and crystal structure of tetra-kis-(1H-pyrazole-κN (2))-palladium(II) dichloride.

Wagner T, Christiansen N, Hrib CG, Kaufmann DE, Edelmann FT - Acta Crystallogr Sect E Struct Rep Online (2014)

The coordination sphere of Pd2+ and the Cl− counter-ions in the title compound. Displacement ellipsoids represent the 50% probability level. [Symmetry code (A): −x + , −y + , −z.]
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4257448&req=5

fig2: The coordination sphere of Pd2+ and the Cl− counter-ions in the title compound. Displacement ellipsoids represent the 50% probability level. [Symmetry code (A): −x + , −y + , −z.]
Mentions: In the crystal structure of the title compound, the Pd2+ ion is located on an inversion centre and is bonded to four neutral pyrazole ligands within a square-planar coordination environment (Fig. 2 ▶). The average Pd—N distance in the [Pd(pyrazole)4]2+ cation is 2.000 (2) Å. This is exactly the same value as found for the Cu—N distance in trans-bis­(perchlorato)-tetra­kis­(pyrazole)­copper(II) [2.000 (1) Å; Edelmann et al., 2008 ▶]. The two chloride anions are not coordinating to the Pd2+ cation. This is in marked contrast to the analogous copper(II) complex [Cu(pyrazole)4Cl2] (Xing et al., 2006 ▶), in which the Cu2+ ion is six-coordinated by four N atoms from four pyrazole ligands and two Cl− ions. The same octa­hedral coordination has also been reported for the manganese(II) analog [Mn(pyrazole)4Cl2] (Lumme, 1985 ▶).

Bottom Line: 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.

View Article: PubMed Central - HTML - PubMed

Affiliation: Chemisches Institut, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, D-39106 Magdeburg, Germany.

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.

No MeSH data available.


Related in: MedlinePlus