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A layered cobalt coordination polymer containing both 4-(2-carboxyl-atoeth-yl)benzoate (ceb) and 1,4-bis-(3-pyridyl-meth-yl)piperazine (3-bpmp) ligands, [Co(C₁₀H₈O₄)(C₁₆H₂₀N₄)(H₂O)₂] _n or [Co(ceb)(3-bpmp)(H₂O)₂] _n , was isolated and structurally characterized by single-crystal X-ray diffraction. Chain-like [Co(ceb)(H₂O)₂] _n units are oriented parallel to [101]. These are connected into (4,4)-grid coordination polymer layers by tethering 3-bpmp ligands. The layer motifs stack in an AAA pattern mediated by O-H⋯N hydrogen-bonding inter-actions between the aqua ligands in one layer and 3-bpmp piperazinyl N atoms in the abutting layer.

The title compound, C₆H₆IN, is the meta-iodinated derivative of aniline. The asymmetric unit contains two mol-ecules. The structure was refined as a two-component inversion twin with a volume ratio of 55.6:44.4. In the crystal, cooperative hydrogen bonds of the N-H⋯N type connect the mol-ecules into infinite chains propagating along the a-axis direction. Dispersive I⋯I contacts extend these chains to sheets perpendicular to the crystallographic c axis.

The title compound, [Fe(C₈H₃N₄O)₂(C₉H₈N₂)₂], was synthesized solvothermally. The complex exhibits a distorted octa-hedral coordination geometry. The Fe²⁺ ion is located on an inversion centre. The octa-hedral FeN₆ coordination sphere is composed of bidentate quinoline-8-amine in the equatorial sites while the axial sites are occupied by 1,1,3,3-tetra-cyano-2-meth-oxy-propenide anions. The crystal structure features hydrogen bonds parallel to the crystallographic b axis and parallel to (110).

In the title compound, C₁₇H₂₂N₂O₅ the pyrrolidine ring is almost planar and subtends a dihedral angle of 85.77 (7)° with the pendant phenyl ring. An intra-molecular N-H⋯O hydrogen bond generates an S(6) loop. In the crystal, the compound forms inversion dimers through O-H⋯O hydrogen bonds from the disordered hydroxyl group to either the hydroxyl or ester carbonyl O atom of the adjacent mol-ecule.

In the title compound, C₂₉H₂₆BrN, the dihedral angles between the fluorene fused-ring system and the pendant phenyl groups are 67.76 (12) and 88.38 (12)°. In the crystal, weak pairwise C-H⋯π inter-actions link the mol-ecules into inversion dimers.

Tin(IV) sulfate dihydrate, Sn(SO₄)₂·2H₂O, was prepared in a reflux of sulfuric acid under oxidizing conditions. Its crystal structure was determined from powder synchrotron X-ray diffraction data and is constructed of (100) layers of [SnO₄(H₂O)₂] octa-hedra (point group symmetry 1) corner-connected by sulfate tetra-hedra. Hydrogen bonds of moderate strength between the water mol-ecules and sulfate O atoms hold the layers together.

The cation of the title salt, C₁₅H₁₄N₃O₃ ⁺·Br^-, has a dihedral angle of 24.26 (6)° between its fused imidazole and 4-nitro-phenyl rings and the N-C-C-O torsion angle associated with the hy-droxy-ethyl substituent is 60.15 (17)°. In the crystal, the bromide ions act as double acceptors for hydrogen bonds from a hydroxyl group (O-H⋯Br) and a fused imidazolium moiety (C-H⋯Br). Additionally, C-H⋯O hydrogen bonds between the phenyl group and hydroxyl oxygen atom create a two-dimensional supra-molecular network extending diagonally in the crystallographic bc plane.

The title compound C₂₂H₁₇ClN₂, also named as TRAM-34, crystallizes in the monoclinic space group P2₁/n. The dihedral angles between the pyrazole ring and the three six-membered rings are 62.28 (9), 69.48 (9) and 71.30 (9)°.

The title compound, C₁₂H₂₀O₄, was prepared from α-pinene in three steps. The ester and acid moieties are cis on the slightly folded cyclo-butane ring. In the crystal, carb-oxy-lic acid bound dimers form layers parallel to (202).

The mol-ecular structure of the title salt, C₁₁H₁₂N₃O₃ ⁺·Br^-, reveals near co-planarity between the the imidazole and 4-nitro-benzene moieties with a dihedral angle of 8.99 (14)° between their planes. A prominent feature in the mol-ecular packing is the bromide anion acting as a double acceptor for O-H⋯Br and C-H⋯Br hydrogen-bonds, leading to a linear chain propagating along [110]. The crystal studied was refined as an inversion twin, with the minor component = 0.081 (8).