1,3-Diiodo­azulene-2-carbonitrile

In the title compound, C₁₁H₅I₂N, the two iodine-atom substitutents with their large atomic sizes lead to short intra­molecular I...H distances (3.01 Å). In the crystal, the tris­ubstituted azulene system forms π-stacks [centroid–centroid distance = 3.6343 (11) Å] along the a-axis direction, showing the characteristic azulene inter­action mode between the electron-rich five-membered ring and the electron-deficient seven-membered ring. I...I [3.9129 (2) Å] non-covalent contacts are observed along with weak C—H...N and C—H...π. bonds.

1,3,5-Tris(bromo­meth­yl)-2,4,6-trimeth­oxy­benzene

There are three independent mol­ecules in the asymmetric unit of the title compound, C₁₂H₁₅Br₃O₃, two of which have approximate trigonal symmetry, the third being conformationally different as it adopts near mirror symmetry. The crystal structure features C—H...Br inter­actions, a weak C—H...O hydrogen bond, π–π inter­actions [minimum ring centroid separation = 3.4927 (18) Å] and a short Br...Br contact [3.5894 (5) Å], resulting in a three-dimensional supramolecular network.

2,2′,2′′-[(2,4,6-Trimeth­oxy­benzene-1,3,5-tri­yl)tris­(methyl­ene)]tris­(isoindole-1,3-dione)

The title mol­ecule, C₃₆H₂₇N₃O₉, adopts an almost symmetric conformation in which the mean planes of the phthalimido units are inclined at dihedral angles of 81.1 (1), 85.3 (1) and 86.3 (1)° with respect to the plane of the central aromatic ring. The O atoms are involved in intra- and inter­molecular C—H...O hydrogen bonding. The crystal structure also features π–π arene inter­actions [minimum ring centroid separation = 3.683 (2) Å]. The present mode of non-covalent interactions leads to a three-dimensional supramolecular architecture.

5-(Naphthalen-1-yl)isophthalic acid–dimethyl sulfoxide–water (2/1/2)

The asymmetric unit of the title compound, 2C₁₈H₁₂O₄·C₂H₆OS·2H₂O, consists of four crystallographically independent mol­ecules of 5-(naphthalen-1-yl)isophthalic acid, two dimethyl sulfoxide and four water mol­ecules. The dihedral angles formed by the the planes of the aromatic fragments of the organic mol­ecules range from 57.4 (1) to 59.1 (1)°. In the crystal, multiple O—H...O hydrogen bonds link the water mol­ecules with the carbonyl and sulfoxide groups, giving rise to double ribbons along the b-axis direction.

4-(Naphthalen-1-yl)pyridine

In the title compound, C₁₅H₁₁N, the mean planes of the aromatic moieties are inclined to one another by 72.9 (1)°. The crystal is stabilized by π–π stacking inter­actions between the pyridine rings of inversion-related mol­ecules, with a centroid–centroid distance of 3.772 (2) Å. In addition, C—H...π contacts involving an α-C—H group of the pyridine ring and the nonsubstituted ring of the naphthalene unit are observed, giving rise to a herringbone-type supramolecular architecture of the naphthalene moiety being contained in the molecule.

3,3′′-Bis(9-hy­droxy­fluoren-9-yl)-1,1′:3′,1′′-terphen­yl

The asymmetric unit of the title compound, C₄₄H₃₀O₂, contains two independent mol­ecules in which the terminal rings of the terphenyl element are inclined at angles of 36.3 (1) and 22.5 (1)° with respect to the central ring and the dihedral angles between the fluorenyl units are 72.3 (1) and 62.8 (1)°. In the crystal, pairs of O—H...O hydrogen bonds link the mol­ecules into inversion dimers. The hy­droxy H atoms not involved in these hydrogen bonds form O—H...π inter­actions in which the central terphenyl rings act as acceptors. Weak C—H...O contacts and π–π [centroid–centroid distance = 4.088 (2) Å] stacking inter­actions also occur. Taking into account directed non-covalent bonding between the molecules, the crystal is constructed of supramolecular strands extending along the a-axis direction.

(E)-2-[2-(3-Nitro­phen­yl)ethen­yl]quinolin-8-ol

In the title compound, C₁₇H₁₂N₂O₃, the mean planes of the benzene ring and the quinoline moiety are inclined to one another by 11.0 (1)°. The nitro substituent is twisted at an angle of 7.9 (2)° with respect to the attached benzene ring. Intra­molecular O—H...N and C—H...N hydrogen bonds occur. The crystal is constructed of mol­ecular stacks without involvement of π-stacking inter­actions, but showing inter­stack association via O—H...O and C—H...O hydrogen bonding. Thus, the supramolecular architecture of the crystal results from stacked molecules stabilized by hydrogen bonding between the stacks.

5-Bromo­benzene-1,3-dicarbo­nitrile

The asymmetric unit of the title compound, C₈H₃BrN₂, consists of two mol­ecules. The crystal structure features undulating mol­ecular sheets with the mol­ecules linked by C—H...N hydrogen bonds with one N atom acting as a bifurcated acceptor. N...Br inter­actions also occur [N...Br = 2.991 (3) and 3.099 (3) Å]. Inter­layer association is accomplished by offset face-to-face arene inter­actions [centroid–centroid distance = 3.768 (4) Å].

(E)-2-[2-(4-Carb­oxy­phen­yl)ethen­yl]-8-hydroxy­quinolin-1-ium chloride ethanol monosolvate

In the title compound, C₁₈H₁₄NO₃⁺·Cl⁻·CH₃CH₂OH, the dihedral angle formed by the mean planes of the quinolinium and benzene rings is 3.4 (1)°, while the carb­oxy substituent is tilted at an angle of 4.8 (1)° with respect to the benzene ring. There is a short N—H...O contact in the cation. In the crystal, due to the planar mol­ecular geometry, two-dimensional aggregates are formed parallel to (221) via C—H...O, C—H...Cl, O—H...Cl and N—H...Cl hydrogen bonds. Inter­layer association is accomplished by O—H_ethanol...Cl and O—H...O_ethanol hydrogen bonds and π–π stacking inter­actions [centroid–centroid distances vary from 3.6477 (12) to 3.8381 (11) Å]. A supra­molecular three-dimensional architecture results from a stacked arrangement of layers comprising the ionic and hydrogen-bonded components.