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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 (2\overline{1}0).

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The crystal strucure of the title compound, C7H9NO, displays N—H...O hydrogen bonds which link mol­ecules related by translation along the b axis, and O—H...N and further N—H...O 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).

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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.

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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—H...F inter­actions and a weak N—H...Br inter­action.

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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—H...O 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.

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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—H...O, C—H...π 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—H...π inter­actions are present between neigbouring stacks. Also, acting between the stacks are the C—H...O inter­actions between the aromatic H atoms of the anthracene and the O atoms of the succinimide.

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In the crystal structure of the title compound, C21H14ClN3OS, mol­ecules assemble into inversion dimers via pairs of N—H...N 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.

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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—H...Br 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—H...Br inter­actions, forming a three-dimensional network. The crystal studied was a pseudo-merohedral twin with twin ratio 0.640 (2):0.360 (2).

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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—H...O inter­actions of bis­(2-hy­droxy­eth­yl)ammonium cation chains to phenolate O atoms. The resulting double-ion chains along [100] are further linked by N—H...O inter­actions, forming chains parallel to [110].

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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—H...O inter­actions between the ammonium cations and the anions, as well as four unique O—H...O inter­actions between the water mol­ecules and the anions.
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