The reaction of mercury(II) chloride dihydrate, propane-1,3-diamine and 4-hydroxypyridine-2,6-dicarboxylic acid in a 1:1:1 molar ratio in aqueous solution, resulted in the formation of the title compound, (C3H12N2)[Hg(C7H3NO5)Cl(H2O)]2·4H2O or (pnH2)[Hg(hypydc)Cl(H2O)]2·4H2O (where pn is propane-1,3-diamine and hypydcH2 is 4-hydroxypyridine-2,6-dicarboxylic acid). The metal atom is coordinated by one chloride group, one water molecule cis to the chloride ligand and one (hypydc)2− ligand. The coordinated water molecule is almost perpendicular to the plane of the aromatic ring of (hypydc)2−. The geometry of the resulting HgClNO3 coordination can be described as distorted square-pyramidal. This structure also contains propane-1,3-diammonium (site symmetry 2) as a counter-ion and four uncoordinated water molecules. There is a wide range of non-covalent interactions consisting of hydrogen bonding [of the types O—H⋯O, N—H⋯O and C—H⋯O, with D⋯A ranging from 2.548 (5) to 3.393 (6) Å] and ion pairing.
Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.004 Å; R factor = 0.042; wR factor = 0.105; data-to-parameter ratio = 15.6.The reaction of chromium(III) nitrate hexahydrate, pyridine-2,6-diamine and 4-hydroxypyridine-2,6-dicarboxylic acid in a 1:2:2 molar ratio in aqueous solution resulted in the formation of the title compound, (C 5 97.77 (17) ] indicate that these two units are almost perpendicular to one another. In the crystal structure, extensive O-HÁ Á ÁO, N-HÁ Á ÁO and C-HÁ Á ÁO hydrogen bonds with DÁ Á ÁA distances ranging from 2.560 (2) to 3.279 (3) Å , ion pairing, C-OÁ Á Á [OÁ Á Á = 3.166 (2) Å ] and -stacking interactions between (hypydc) 2À and (pydaH) + rings [with a centroid-centroid distance of 3.3353 (14) Å ] contribute to the formation of a three-dimensional supramolecular structure.
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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.
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