Acta Cryst. (2009). E65, m2-m3  [ doi:10.1107/S1600536808039378 ]

Aqua(1,10-phenanthroline)(pyridine-2,6-dicarboxylato)nickel(II) pyridine-2,6-dicarboxylic acid solvate tetrahydrate

J. Safaei-Ghomi, H. Aghabozorg, E. Motyeian and M. Ghadermazi

Abstract: The title compound, [Ni(C₇H₃NO₄)(C₁₂H₈N₂)(H₂O)]·C₇H₅NO₄·4H₂O or [Ni(pydc)(phen)(H₂O)].pydcH₂·4H₂O, was obtained by the reaction of nickel(II) nitrate hexahydrate with the proton-transfer compound (phenH)₂(pydc) (phen is 1,10-phenanothroline and pydcH₂ is pyridine-2,6-dicarboxylic acid) in aqueous solution. Both the cationic and anionic portions of the starting proton-transfer compound are involved in the complexation. The Ni^II atom has a distorted octahedral geometry and is hexacoordinated by three O atoms and three N atoms from one phen fragment (as a bidentate ligand), one (pydc)^2- unit (as a tridentate ligand) and one water molecule. In the crystal structure, extensive O-HO, O-HN and C-HO hydrogen bonds with DA distances ranging from 2.573 (2) to 3.385 (2) Å, - interactions between the phen ring systems [with centroid-centroid distances of 3.4694 (12), 3.4781 (11) and 3.8310 (11) Å] and intermolecular C-O interactions [C distances of 3.4812 (17), 3.5784 (16) and 3.5926 (16) Å] connect the various components together.

Online 3 December 2008

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