A novel mononuclear nickel complex coordinated by 2-(2-hydroxyethyl)pyridine has been synthesized and structurally characterized by X-ray diffraction techniques and photoluminescence spectroscopy. TDDFT calculations have been performed to rationalize the structure explored for this and a related polymeric Cu complex.
Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.002 Å; R factor = 0.021; wR factor = 0.054; data-to-parameter ratio = 16.2.In the anion of the title compound, (C 7 H 11 N 2 )[CoCl 3 -(C 7 H 10 N 2 )], the Co II ion is coordinated by one N atom from a 4-(dimethylamino)pyridine (DMAP) ligand and three Cl atoms, forming a CoNCl 3 polyhedron with a distorted tetrahedral geometry. In the crystal, cations and anions are linked via weak N-HÁ Á ÁCl and C-HÁ Á ÁCl hydrogen bonds. Double layers of complex anions stack along the b-axis direction, which alternate with double layers of 4-(dimethylamino)-pyridinium cations.
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Data collectionBruker APEXII diffractometer 7932 measured reflections 3230 independent reflections 2982 reflections with I > 2(I) R int = 0.012
In the title salt, [Co(C7H9NO)2(H2O)2]Cl2, the CoII cation, located on an inversion center, is N,O-chelated by two hydroxyethylpyridine ligands and coordinated by two water molecules in a distorted O4N2 octahedral geometry. In the crystal, the Cl− anions link with the complex cations via O—H⋯Cl hydrogen bonds, forming a three-dimensional supramolecular architecture. π–π stacking is observed between the pyridine rings of adjacent molecules [centroid–centroid distance = 3.5810 (11) Å].
The title organic–inorganic salt, (C7H11N2)2[LaCl(H2O)8]Cl4·3H2O, consists of two 4-(dimethylamino)pyridinium and one [La(H2O)8Cl]2+ cations, four chloride anions and three solvent water molecules. In the crystal, the various units are connected by N—H⋯Cl, O—H⋯Cl, O—H⋯O and N—H⋯O hydrogen bonds, forming a network of alternating organic and inorganic layers. The 4-(dimethylamino)pyridinium cations stack along the c axis, while the inorganic layers lie parallel to the ac plane. The chloride anions are located between these entities, forming hydrogen bonds with the NH atom of the pyridinium ions and the water molecules. There are also C—H⋯Cl hydrogen bonds present involving one of the 4-(dimethylamino)pyridinium cations, resulting in the formation of a three-dimensional supramolecular architecture.
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