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The title complex exhibits a distorted octa­hedral geometry about the metal centre, which coordinates two tridentate ligands that are perpendicular to each other.

In the title compound, [Ni(C₁₃H₁₃N₄S)₂]·0.33CH₃OH·0.67H₂O, the Ni^II atom is coordinated by two tridentate quinoline-2-carboxaldehyde 4-ethyl­thio­semi­car­ba­zonate ligands in a distorted octa­hedral shape. At 100 K, the crystal symmetry is monoclinic (space group P2₁/n). A mixture of water and methanol crystallizes with the title complex, and one of the ethyl groups in the coordinating ligands is disordered over two positions, with an occupancy ratio of 58:42. There is inter­molecular hydrogen bonding between the solvent mol­ecules and the amine and thiol­ate groups in the ligands. No other significant inter­actions are present in the crystal packing.

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The crystal structure of a new ethidium salt has been determined. Two ethidium cations self-associate to form a dimer through π–π inter­actions.

In the title salt solvate (systematic name: 8-amino-5-ethyl-6-phenyl­phenanthridin-5-ium benzoate methanol monosolvate), C₂₁H₂₀N₃ ⁺·C₆H₅CO₂ ⁻·CH₃OH, two ethidium cations, C₂₁H₂₀N₃ ⁺, dimerize about a twofold axis through π–π inter­actions [inter-centroid separation = 3.6137 (4) Å]. The benzoate anions are connected through hydrogen bonding with the –NH₂ groups of the ethidium cations and the –OH group of the MeOH mol­ecule. The MeOH mol­ecule also accepts a hydrogen bond from the –NH₂ group of the ethidium cation. The result is a one-dimensional hydrogen-bonded chain along the b-axis direction.

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The π-conjugated planar title mol­ecules are assembled through C—H⋯π inter­actions between neighboring mol­ecules, resulting in stacking along the c-axis.

The title compound, C₂₂H₂₄N₂O₂, crystallizes in space group P2₁/n. The mol­ecular structure is almost planar except for a tilt of the phenyl rings. The allyl groups on both ends exhibit the trans-form and the connected N atoms show sp ² character. The mol­ecules are stacked and assembled along the c-axis direction by C—H⋯π inter­actions.

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The cation of the title hydrated salt is a di­aza­borinane featuring substitution at 1, 2, and 3 positions in the nitro­gen–boron six-membered heterocycle. In the crystal, the cations stack along [100] in an alternating head-to-tail manner, while the iodide ion and water mol­ecule form one-dimensional hydrogen-bonded chains beside the cation stack. The cation stacks and I⁻–water chains are crosslinked by N—H⋯I and N—H⋯O hydrogen bonds.

The cation of the title hydrated salt, C₁₇H₁₇BN₃ ⁺·I⁻·H₂O, is a di­aza­borinane featuring substitution at the 1, 2, and 3 positions in the nitro­gen–boron six-membered heterocycle. The cation is approximately planar with a dihedral angle between the pyridyl ring and the di­aza­borinane ring system of 5.40 (5)°. In the crystal, the cations stack along [100] in an alternating head-to-tail manner, while the iodide ion and water mol­ecule form one-dimensional hydrogen-bonded chains beside the cation stack. The cation stacks and I⁻–water chains are crosslinked by N—H⋯I and N—H⋯O hydrogen bonds.

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The crystal structure model of germacrone type II determined from single-crystal X-ray data is compared with that of a previous synchrotron X-ray powder study

The extraction and purification procedures, crystallization and crystal structure refinement (single-crystal X-ray data) of germacrone type II, C₁₅H₂₂O, are presented. The structural results are compared with a previous powder X-ray synchrotron study [Kaduk et al. (2022#). Powder Diffr. 37, 98–104], revealing significant improvements in terms of accuracy and precision. Hirshfeld atom refinement (HAR), as well as Hirshfeld surface analysis, give insight into the inter­molecular inter­actions of germacrone type II.

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The chiral title compound forms supra­molecular chains, through N—H⋯O hydrogen bonds between the amide and carboxyl­ate groups.

The title mol­ecule, C₁₂H₁₅NO₅, is a methyl carbamate derivative obtained by reacting (R)-2-phenyl­glycinol and methyl chloro­formate, with calcium hydroxide as heterogeneous catalyst. Supra­molecular chains are formed in the [100] direction, based on N—H⋯O hydrogen bonds between the amide and carboxyl­ate groups. These chains weakly inter­act in the crystal, and the phenyl rings do not display significant π–π inter­actions.

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There are two crystallographically independent mol­ecules in the asymmetric unit of the title compound, which are linked by pairwise O—H⋯O hydrogen bonds.

The title compound, C₁₃H₁₀FNO₂, was obtained by the reaction of 2-bromo-4-fluoro­benzoic acid with aniline. There are two independent mol­ecules, A and B, in the asymmetric unit, with slight conformational differences: the dihedral angles between the aromatic rings are 55.63 (5) and 52.65 (5)°. Both mol­ecules feature an intra­molecular N—H⋯O hydrogen bond. In the crystal, the mol­ecules are linked by pairwise O—H⋯O hydrogen bonds to form A–B acid–acid dimers and weak C—H⋯F inter­actions further connect the dimers.

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Structural analysis of the title diasteromeric sulfone determines this to be the erythro (RR/SS) isomer, and was pivotal in showing that the 1,3-elimination reactions of these compounds, which lead to substituted stilbenes, occur with inversion at each asymmetric carbon atom.

The title compound, C₁₆H₁₇BrO₂S, crystallizes as the erythro (RR/SS) isomer of a pair of sulfones that were diastereomeric due to chirality of the α-carbon atoms on the sulfone sulfur atom. The structural analysis was pivotal in showing that the 1,3 elimination reactions of these compounds, which lead to substituted stilbenes, occur with inversion at each asymmetric carbon atom. In the crystal, C—H⋯Br and C—H⋯O hydrogen bonds link the mol­ecules into a tri-periodic inter­molecular network.

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The cationic complex of the title salt, [Ru(C₁₉H₁₃N₅)₂](PF₆)₂·3C₄H₁₀O, has the Ru atom in a slightly distorted octa­hedral environment of two tridentate benzimdazolyl-pyridine ligands and displays extensive π–π and C—H⋯π inter­actions.

The title compound, [Ru(C₁₉H₁₃N₅)₂](PF₆)₂·3C₄H₁₀O, was obtained from the reaction of Ru(bimpy)Cl₃ [bimpy is 2,6-bis­(1H-benzimidazol-2-yl)pyridine] and bimpy in refluxing ethanol followed by recrystallization from diethyl ether/aceto­nitrile. At 125 K the complex has ortho­rhom­bic (Pca2₁) symmetry. It is remarkable that the structure is almost centrosymmetric. However, refinement in space group Pbcn leads to disorder and definitely worse results. It is of inter­est with respect to potential catalytic reduction of CO₂. The structure displays N—H⋯O, N—H⋯F hydrogen bonding and significant π–π stacking and C—H⋯π stacking inter­actions.

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In the structure of the title compound, the Ru—N distances of the DMAP ligands are influenced by the trans chloride or di­methyl­sulfoxide-κS ligands.

The structure of the title compound, [RuCl₂(C₇H₁₀N₂)₂(C₂H₆OS)₂], has monoclinic (P2₁/n) symmetry. The Ru—N distances of the coordination compound are influenced by the trans chloride or di­methyl­sulfoxide-κS ligands. The mol­ecular structure exhibits disorder for two of the terminal methyl groups of a dimethyl sulfoxide ligand.

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