Bis(2-amino-6-methylpyridinium)trans-diaquabis(pyrazine-2,3-dicarboxylato)cuprate(II) hexahydrate

Hossein Eshtiagh-Hosseini,Teresa Szymańska-Buzar,Masoud Mirzaei,Andrzej Kochel,Azam Hassanpoor

doi:10.1107/s1600536811008981

Hossein Eshtiagh-Hosseini, Teresa Szymańska-Buzar + Show 3 more

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https://doi.org/10.1107/s1600536811008981

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Abstract

The title compound, (C6H9N2)2[Cu(C6H2N2O4)2(H2O)2]·6H2O, was obtained by the reaction of CuCl2·2H2O with pyrazine-2,3-dicarboxylic acid (pyzdcH2) and 2-amino-6-methylpyridine (2a-6mpy) in aqueous solution. The CuII atom is located on an inversion centre and has an overall octahedral coordination environment. Two N and two O atoms from (pyzdc)2− ligands define the equatorial plane and two water molecules are in axial positions, resulting in a typical tetragonally Jahn–Teller-distorted environment. Extensive classical O—H⋯O, O—H⋯N and N—H⋯O and non-classical C—H⋯O hydrogen bonds, as well as π–π stacking interactions between aromatic rings of the cations [centroid–centroid distance = 3.58 (9) Å], lead to the formation of a three-dimensional supramolecular structure.

Highlights

The title compound, (C6H9N2)2[Cu(C6H2N2O4)2(H2O)2]6H2O, was obtained by the reaction of CuCl22H2O with pyrazine-2,3-dicarboxylic acid and 2-amino-6methylpyridine (2a-6mpy) in aqueous solution
The CuII atom is located on an inversion centre and has an overall octahedral coordination environment
Two N and two O atoms from2 ligands define the equatorial plane and two water molecules are in axial positions, resulting in a typical tetragonally Jahn–Teller-distorted environment

Summary

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Mirzaei,a* Teresa Szymańska-Buzarb and Andrzej Kochelb a Department of Chemistry, School of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran, and bFaculty of Chemistry, University of Wrocław, F. R factor = 0.030; wR factor = 0.082; data-to-parameter ratio = 16.8. The title compound, (C6H9N2)2[Cu(C6H2N2O4)2(H2O)2]6H2O, was obtained by the reaction of CuCl22H2O with pyrazine-2,3-dicarboxylic acid (pyzdcH2) and 2-amino-6methylpyridine (2a-6mpy) in aqueous solution. The CuII atom is located on an inversion centre and has an overall octahedral coordination environment. Two N and two O atoms from (pyzdc) ligands define the equatorial plane and two water molecules are in axial positions, resulting in a typical tetragonally Jahn–Teller-distorted environment. Extensive classical O—H O, O—H N and N—H O and nonclassical C—H O hydrogen bonds, as well as – stacking interactions between aromatic rings of the cations [centroid–.

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