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Acta Cryst. (2007). E63, m3089-m3090 [ doi:10.1107/S1600536807058722 ]

4,4'-Bipyridinediium triaquabis(pyridine-2,6-dicarboxylato)strontium(II) trihydrate

J. Soleimannejad, H. Aghabozorg, S. Hooshmand and H. Adams

Abstract: The reaction of strontium(II) nitrate with pyridine-2,6-dicarboxylic acid, (pydcH₂) and 4,4'-bipyridine (bipy) in a 1:2:4 molar ratio leads to the formation of the title compound, (C₁₀H₁₀N₂)[Sr(C₇H₃NO₄)₂(H₂O)₃]·3H₂O, or (bipyH₂)[Sr(pydc)₂(H₂O)₃]·3H₂O, in aqueous solution. This compound is composed of an anionic complex, [Sr(pydc)₂(H₂O)₃]^2-, a protonated 4,4'-bipyridine as a counter-ion, (bipyH₂)²⁺ (site symmetry $\\overline 1$ ), and three uncoordinated water molecules. The anion is a nine-coordinate complex, with a distorted tricapped trigonal-prismatic geometry around the Sr^II atom. The coordination environment consists of two tridentate pyridine-2,6-dicarboxylate, (pydc)^2-, groups and three O atoms of the coordinated water molecules. In the crystal structure, intermolecular O-HO, N-HO and C-HO hydrogen bonds, [pi] - [pi] stacking between two aromatic rings [with distances of 3.5723 (7)-3.7494 (7) Å] and C-O [pi] stacking [distance of 3.5228 (12) Å] connect the various components into a supramolecular structure.

Online 23 November 2007