journal menu
organic compounds
Open 
access
access
In the title compound, C14H16N6O6·C2H6O·H2O, both substituents of the benzene ring are approximately planar with maximum deviations from the mean plane of 0.0561 (12) (an imine N atom) and 0.1419 (11) Å (a methoxy O atom). The substituents are tilted out of the plane of the benzene ring by 64.48 (4) and 70.08 (5)°, respectively. In the crystal, molecules form centrosymmetric dimers associated via pairs of N—H
O hydrogen bonds. The dimers are linked via the water and ethanol molecules, forming two-dimensional hydrogen-bond networks lying parallel to (100).
O hydrogen bonds. The dimers are linked via the water and ethanol molecules, forming two-dimensional hydrogen-bond networks lying parallel to (100).organic compoundsOpen access
access
In the crystal structure of the title compound, C6H7N·CH4N2O, the 2-methylpyridine and urea molecules are linked via N—HO and N—HN hydrogen bonds, forming ribbons extending along the a axis. The dihedral angle between the 2-methylpyridine and urea mean planes is 89.09 (9)°. The methyl group shows rotational disorder wherein the H atoms are located over two sets of sites with equal occupancies.
O and N—HN hydrogen bonds, forming ribbons extending along the a axis. The dihedral angle between the 2-methylpyridine and urea mean planes is 89.09 (9)°. The methyl group shows rotational disorder wherein the H atoms are located over two sets of sites with equal occupancies.metal-organic compoundsOpen access
access
In the title compound, [Ni(C8H6ClO3)2(H2O)4], the NiII ion is located on a crystallographic inversion centre and is octahedrally coordinated by two 2-(4-chlorophenoxy)acetate ligands in axial positions and by four water molecules in the equatorial plane. The acetate ligands are bound to the NiII ion in a monodentate manner through a carboxylate O atom. In the crystal, O—HO hydrogen bonds link the molecules, forming a two-dimensional supramolecular network lying parallel to the ab plane.
O hydrogen bonds link the molecules, forming a two-dimensional supramolecular network lying parallel to the ab plane.organic compoundsOpen access
access
In the title compound, C9H10N2OS, the thienopyrimidine ring system is almost planar [greatest deviation from the mean plane = 0.0318 (13) Å for the S atom]. The crystal packing features C—HO hydrogen bonds and π–π stacking interactions between inversion-related pairs of molecules with a centroid–centroid distance of 3.530 (3) Å.
O hydrogen bonds and π–π stacking interactions between inversion-related pairs of molecules with a centroid–centroid distance of 3.530 (3) Å.organic compoundsOpen access
access
A new polymorph of 2-(benzotriazol-2-yl)acetic acid, C8H7N3O2, crystallizes in the space group C2/c (Z = 8). The non-planar molecule has a synplanar conformation of the carboxy group. The crystal structure features helices parallel to the b axis sustained by O—HN hydrogen bonding which are similar to those in the known polymorph [Giordano & Zagari (1978). J. Chem. Soc. Perkin Trans. 2, pp. 312–315]. However, in the title structure, columns are formed by π–π stacking interactions between benzotriazole fragments of centrosymmetrically related adjacent molecules [centroid-centroid distances = 3.593 (10) and 3.381 (10) Å] whereas π–π stacking interactions are not observed in the other polymorph. In the crystal of the title compound, C—HO interactions are also observed.
N hydrogen bonding which are similar to those in the known polymorph [Giordano & Zagari (1978). J. Chem. Soc. Perkin Trans. 2, pp. 312–315]. However, in the title structure, columns are formed by π–π stacking interactions between benzotriazole fragments of centrosymmetrically related adjacent molecules [centroid-centroid distances = 3.593 (10) and 3.381 (10) Å] whereas π–π stacking interactions are not observed in the other polymorph. In the crystal of the title compound, C—HO interactions are also observed.
