Tetrakis(μ2-2-methyl-3,5-dinitrobenzoato-κ2O1:O1′)bis[aquacopper(II)] tetrahydrate

• Main Authors: Muhammad Danish, Sabiha Ghafoor, M. Nawaz Tahir, Nazir Ahmad, Mehwish Nisa
• Format: Article
• Language: English
• Published: International Union of Crystallography 2011-02-01
• Series: Acta Crystallographica Section E
• Online Access: http://scripts.iucr.org/cgi-bin/paper?S1600536811000547

The title compound, [Cu2(C8H5N2O6)4(H2O)2]·4H2O, forms a centrosymmetric paddle-wheel-type dimer with an intramolecular Cu...Cu distance of 2.6540 (4) Å. The CuII atom is in a square-pyramidal coordination environment formed by four O atoms of four carboxylate groups and one water molecule, which is located in the apical position. The carboxylate groups are twisted relative to the benzene rings by 11.09 (16) and 45.55 (19)°. The nitro groups are not coplanar with the parent aromatic rings [dihedral angles = 16.2 (3)–51.45 (14)°]. O—H...O hydrogen bonds between the coordinated water molecules and one of the nitro groups, as well as π–π stacking interactions [centroid–centroid distance = 3.5764 (12) Å] between the benzene rings, assemble the complex molecules into a one-dimensional polymeric structure which is further extended into a three-dimensional polymeric network via O—H...O hydrogen bonds involving the water molecules of crystallization.