N-(Benzothia­zol-2-yl)-3-chloro­benzamide

The title mol­ecule, C14H9ClN2OS, exists in the solid state in its amide form with a typical C=O bond length, as well as shortened C—N bonds. The plane containing the HNCO atoms subtends dihedral angles of 12.3 (4) and 8.1 (3)° with the planes of the phenyl ring and benzothia­zole group, respectively, whereas the dihedral angle between the planes of the phenyl ring and the benzothia­zole group is 5.96 (6)°. In the crystal, mol­ecules form inter­molecular N—H⋯N hydrogen bonds, generating independent scissor-like R 2 2(8) dimers

(E)-1-(2,4-Dinitro­phen­yl)-2-pentyl­idenehydrazine

The title compound, C11H14N4O4, is essentially planar with an r.m.s. deviation for the 19 non-H atoms of 0.152 Å. The conformation about the C=N bond is E, and the mol­ecule has a U-shape as the butyl group folds over towards the aromatic system. An intra­molecular C—H⋯N inter­action occurs. The crystal packing is dominated by N—H⋯O hydrogen bonding and C—H⋯O contacts, leading to twisted zigzag supra­molecular chains along the c direction. The crystal packing brings two nitro O atoms into an unusually close proximity of 2.686 (4) Å. While the nature of this inter­action is not obvious, there are several precendents for such short nitro–nitro O⋯O contacts of less than 2.70 Å in the crystallographic literature

3-Chloro-N-cyclo­hexyl­benzamide

In the title mol­ecule, C13H16ClNO, the mean plane of the atoms in the –CONH– group forms a dihedral angle of 42.0 (4)° with the benzene ring plane. In the crystal structure, mol­ecules are linked by inter­molecular N—H⋯O hydrogen bonds, generating C(4) chains along [100]

4-Nitro­phenyl 4-bromo­benzoate

In the crystal structure of the title compound, C13H8BrNO4, mol­ecules are linked into chains along [101] by weak C—H⋯O hydrogen bonds and Br⋯O contacts [3.140 (4) Å]. The planes of the nitrated and brominated aryl rings form a dihedral angle of 64.98 (10)°, indicating a twist in the mol­ecule

Diaqua­tetra­chloridotin(IV)–diglyme (1/2)

In the title 1:2 adduct, [SnCl4(H2O)2]·2C6H14O3, the SnIV atom (site symmetry 2) adopts a cis-SnO2Cl4 octa­hedral geometry. In the crystal structure, O—H⋯O hydrogen bonds lead to associations of one metal complex and two diglyme mol­ecules

Redetermination of phenyl­hydrazinium chloride

In the redetermined structure [Koo (1965 ▶). Bull. Chem. Soc. Jpn, 38, 286] of the title compound, C6H9N2 +·Cl−, the H atoms have been located and the hydrogen-bonding scheme established. A series of N—H⋯Cl and N—H⋯N hydrogen bonds leads to a layered network parallel to the (010) plane

4-Aza-1-azoniabicyclo­[2.2.2]octa­ne–2-amino­benzoate–2-amino­benzoic acid (1/1/1)

A 4-aza-1-azoniabicyclo­[2.2.2]octane cation, a 2-amino­benzoate anion and a neutral 2-amino­benzoic acid mol­ecule comprise the asymmetric unit of the title compound, C6H13N2 +·C7H6NO2 −·C7H7NO2. An intra­molecular N—H⋯O hydrogen bond occurs in the anion and in the neutral 2-amino­benzoic acid mol­ecule. The cation provides a charge-assisted N—H⋯O hydrogen bond to the anion, and the 2-amino­benzoic acid mol­ecule forms an O—H⋯N hydrogen bond to the unprotonated amino N atom in the cation. In this way, a three-component aggregate is formed. These are connected into a three-dimensional network by amino–carboxyl­ate N—H⋯O hydrogen bonds. N—H⋯N hydrogen bonds are also observed

Structural systematics and conformational analyses of a 3x3 isomer grid of fluoro-N-(pyridyl)benzamides: physicochemical correlations, polymorphism and isomorphous relationships

An isomer grid of nine fluoro-N-(pyridyl)benzamides (Fxx) (x = para-/meta-/ortho-) has been examined to correlate structural relationships between the experimental crystal structure and ab initio calculations, based on the effect of fluorine (Fx) and pyridine N-atom (x) substitution patterns on molecular conformation. Eight isomers form N—H...N hydrogen bonds, and only one (Fom) aggregates via intermolecular N—H...O=C interactions exclusively. The Fpm and Fom isomers both crystallize as two polymorphs with Fpm_O (N—H...O=C chains, P-syn) and Fpm_N (N— H...N chains, P-anti) both in P21/n (Z0 = 1) differing by their meta-N atom locations (P-syn, P-anti; Npyridine referenced to N—H), whereas the disordered Fom_O is mostly P-syn (Z` = 6) compared with Fom_F (P-anti) (Z` = 1). In the Fxo triad twisted dimers form cyclic R22(8) rings via N—H...N interactions. Computational modelling and conformational preferences of the isomer grid demonstrate that the solid-state conformations generally conform with the most stable calculated conformations except for the Fxm triad, while calculations of the Fox triad predict the intramolecular N— H...F interaction established by spectroscopic and crystallographic data. Comparisons of Fxx with related isomer grids reveal a high degree of similarity in solid-state aggregation and physicochemical properties, while correlation of the melting point behaviour indicates the significance of the substituent position on melting point behaviour rather than the nature of the substituent

(E)-N′-(2-Bromo­benzyl­idene)-2-fluoro­benzohydrazide

The title compound, C14H10BrFN2O, adopts an E geometry about the C=N bond. The dihedral angle between the mean planes of the two benzene rings is 81.5 (6)°. In the crystal, mol­ecules are linked through inter­molecular N—H⋯O hydrogen bonds, forming chains running along the b axis