Propane-1,2-diammonium bis(pyridine-2,6-dicarboxylato-κ3O,N,O′)nickelate(II) tetrahydrate

• Main Authors: Mohammad Ghadermazi, Jafar Attar Gharamaleki, Sara Bagheri, Mohammad Heidari, Hossein Aghabozorg
• Format: Article
• Language: English
• Published: International Union of Crystallography 2008-07-01
• Series: Acta Crystallographica Section E
• Online Access: http://scripts.iucr.org/cgi-bin/paper?S1600536808016309

The reaction of nickel(II) nitrate hexahydrate, propane-1,2-diamine and pyridine-2,6-dicarboxylic acid in a 1:2:2 molar ratio in aqueous solution resulted in the formation of the title compound, (C3H12N2)[Ni(C7H3NO4)2]·4H2O or (p-1,2-daH2)[Ni(pydc)2]·4H2O (where p-1,2-da is propane-1,2-diamine and pydcH2 is pyridine-2,6-dicarboxylic acid). The geometry of the resulting NiN2O4 coordination can be described as distorted octahedral. Considerable C=O...π stacking interactions are observed between the carboxylate C=O groups and the pyridine rings of the (pydc)2− fragments, with O...π distances of 3.1563 (12) and 3.2523 (12) Å and C=O...π angles of 95.14 (8) and 94.64 (8)°. In the crystal structure, a wide range of non-covalent interactions, consisting of hydrogen bonding [O—H...O, N—H...O and C—H...O, with D...A distances ranging from 2.712 (2) to 3.484 (2) Å], ion pairing, π–π [centroid-to-centroid distance = 3.4825 (8) Å] and C=O...π stacking, connect the various components to form a supramolecular structure.