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 SrII 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—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds, π–π stacking between two aromatic rings [with distances of 3.5723 (7)–3.7494 (7) Å] and C—O⋯π stacking [distance of 3.5228 (12) Å] connect the various components into a supramolecular structure.
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