organic compounds
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In the title compound, C13H9NO8·CH3OH, the main molecule possesses three carboxylic acid groups, which are asymmetrically distributed around the molecule core. This results in hydrogen-bonding motifs ranging from a chain to various rings. The combination of the chain motif together with a carboxylic dimer R22(8) ring motif creates a ribbon of molecules propagating along the c-axis direction. A second ribbon results from the combination of the chain motif together with a methanol solvent molecule and carboxyl-containing R44(12) ring motif. These two ribbons combine alternately, forming a hydrogen-bonded layer of molecules parallel to (20).
organic compounds
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The crystal strucure of the title compound, C7H9NO, displays N—HO hydrogen bonds which link molecules related by translation along the b axis, and O—HN and further N—HO hydrogen bonds which link molecules related by the 21 screw axis along the c axis. The resulting combination is a hydrogen-bonded layer of molecules parallel to (011).
metal-organic compounds
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In the title compound, [Fe(C10H15)(C6H12N4)(CO)2]BF4, the arrangement around the FeII atom corresponds to a three-legged piano stool. The pentamethylcyclopentadienyl (Cp*) ligand occupies three coordination sites, while two CO ligands and one N atom of the hexamethylenetetramine ligand occupy the remaining coordination sites, completing a pseudo-octahedral geometry. Both the complex cation and the BF4− anion reside on crystallographic mirror planes. The Fe—N bond length is 2.069 (2) and the Fe—Cp*(centroid) distance is 1.7452 (3) Å.
metal-organic compounds
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The title compound, [Fe(η5-C5H5)(NH2CH2CHBrCH2Br)(CO)2](BF4) contains an FeII cation with a three-legged piano-stool coordination. The NH2CH2CHBrCH2Br ligand contains a chiral carbon atom. The Fe—N bond length is 2.011 (3) Å and the Fe—Cp centroid distance is 1.7189 (5) Å. In the crystal, the ions are linked via two N—HF interactions and a weak N—HBr interaction.
organic compounds
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In the title hydrated salt, C8H18N+·C4H5O4−·H2O, the cyclooctyl ring of the cation is disordered over two positions in a 0.833 (3):0.167 (3) ratio. The structure contains various O—H.·O and N—HO interactions, forming a hydrogen-bonded layer of molecules perpendicular to the c axis. In each layer, the ammonium cation hydrogen bonds to two hydrogen succinate anions and one water molecule. Each hydrogen succinate anion hydrogen bonds to neighbouring anions, forming a chain of molecules along the b axis. In addition, each hydrogen succinate anion hydrogen bonds to two water molecules and the ammonium cation.
organic compounds
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In the molecular structure of title compound, C18H13NO2, the succinimide ring is orientated away from the plane of the anthracene moiety by 71.94 (4)°. The crystal structure features three different types of intermolecular interactions, viz. C—HO, C—Hπ and π–π bonds. Molecules along the b axis stack on each other as a result of π–π interactions which have a centroid–centroid distance of 3.6780 (15) Å, while C—Hπ interactions are present between neigbouring stacks. Also, acting between the stacks are the C—HO interactions between the aromatic H atoms of the anthracene and the O atoms of the succinimide.
organic compounds
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In the crystal structure of the title compound, C21H14ClN3OS, molecules assemble into inversion dimers via pairs of N—HN hydrogen bonds involving the N—H hydrogen of the thiazine ring and the N atom of the pyridine ring. There is a close intramolecular contact [2.570 (2) Å] between the carbonyl O atom of the benzamide and the S atom of the puckered thiazine ring. The title compound can exist in two tautomeric forms, viz. amino or imino. The observed structure is compatible with the imino form on the basis of observed residual electron density and the two C—N bond lengths of 1.308 (2) and 1.353 (2) Å.
organic compounds
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The title salt, C4H10Br2N+·Br−, crystallizes with four cations and four anions in the asymmetric unit. In the crystal, the bis(2-bromoethyl)ammonium cations and bromide anions are linked into chains by N—HBr hydrogen bonds describing a binary C21(4) motif along [010]. Each of these chains is formed by a unique cation and anion pair. The ammonium cations occur in the less preferred anti conformation, characterized by different NCCBr torsion angles. Adjacent chains are linked by weak C—HBr interactions, forming a three-dimensional network. The crystal studied was a pseudo-merohedral twin with twin ratio 0.640 (2):0.360 (2).
organic compounds
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In the crystal structure of the 1:1 title salt, C4H12NO2+·C6H4BrO−, hydrogen-bonding interactions originate from the ammonium cation, which adopts a syn conformation. A gauche relationship between the C—O and C—N bonds of the 2-hydroxyethyl fragments also facilitates O—HO interactions of bis(2-hydroxyethyl)ammonium cation chains to phenolate O atoms. The resulting double-ion chains along [100] are further linked by N—HO interactions, forming chains parallel to [110].
organic compounds
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The title organic salt, 6C3H10N+·C10H2O84−·C10H4O82−·4H2O, contains seven independent entities in the asymmetric unit which comprises three propylammonium cations, two water molecules, half a 2,5-dicarboxybenzene-1,4-carboxylate dianion (H2btc2−) and half a benzene-1,2,4,5-tetracarboxylate tetraanion (btc4−), the latter two anions being located about centres of inversion. One of the water molecules is disordered over two positions in a 0.55 (2):0.45 (2) ratio. The combination of molecular ions and water molecules results in an extensive and complex three-dimensional network of hydrogen bonds, the network being made up of nine unique N—HO interactions between the ammonium cations and the anions, as well as four unique O—HO interactions between the water molecules and the anions.