Bis[μ-2,5-bis­(pyridin-2-yl)-1,3,4-thia­diazole-κ⁴N²,N³:N⁴,N⁵]bis­[(nitrato-κO)silver(I)] tetra­hydrate

The self-assembly of an angular 2,5-bis­(pyridin-2-yl)-1,3,4-thia­diazole ligand (L) with silver nitrate (AgNO₃) produced a new dinuclear silver(I) coordination complex, [Ag₂(C₁₂H₈N₄S)₂(NO₃)₂]·4H₂O, which crystallizes with two Ag atoms bridged by two L ligands. The Ag atom is surrounded by four N atoms of L and by one O from the nitrate anion defining a distorted square pyramid. The atoms comprising the dication are nearly coplanar, with an r.m.s. deviation of 0.1997 Å. Mol­ecules are linked by C—H...O and O—H...O hydrogen bonds through nitrate anions and water mol­ecules, forming a two-dimensional porous network. The overall structure involves stacking of Ag complex layers along the b axis. The cohesion in the three-dimensional architecture is ensured by O...Ag inter­actions.

N-(2-Bromo-4-methyl­phen­yl)-2-(5-methyl-2-phenyl­pyrazolo­[1,5-a]pyrimidin-7-yl)acetamide

The fused pyrazole and pyrimidine rings in the title compound, C₂₂H₁₉BrN₄O, are almost coplanar, their planes being inclined to one another by 2.08 (13)°. The dihedral angles formed by the mean plane of the fused ring system and the phenyl and benzene rings are 16.21 (4) and 82.84 (4)°, respectively. An intra­molecular N—H...N hydrogen bond is observed. In the crystal, mol­ecules form inversion dimers via pairs of C—H...O hydrogen bonds. π–π inter­actions, with centroid–centroid distances of 3.4916 (9) Å, connect the dimers into a three-dimensional network.

(1S,3S,8R,9S,11R)-10,10-Di­chloro-3,7,7,11-tetra­methyl­tetra­cyclo[6.5.0.0^1,3.0^9,11]trideca­ne

The title compound, C₁₇H₂₆Cl₂, was synthesized from β-himachalene (3,5,5,9-tetra­methyl-2,4a,5,6,7,8-hexa­hydro-1H-benzo­cyclo­heptene), which was isolated from the essential oil of the Atlas cedar (Cedrus Atlantica). The asymmetric unit contains two independent mol­ecules with similar conformations. Each mol­ecule is built up from fused six- and seven-membered rings and two three-membered rings from the reaction of β-himachalene with di­chloro­carbene. In both mol­ecules, the six-membered ring has a half-chair conformation, whereas the seven-membered ring displays a boat conformation. The absolute configuration was established from anomalous dispersion effects.

1,3-Bis(prop-2-yn-1-yl)-1H-anthra[1,2-d]imidazole-2,6,11(3H)-trione

In the title compound, C₂₁H₁₂N₂O₃, the fused-ring system is roughly planar, the largest deviation from the mean plane being 0.084 (2) Å. The two prop-2-yn-1-yl groups are almost perpendicular to the fused ring plane, making C—C—N—C torsion angles of −103.4 (2) and −105.3 (2)°, and point in opposite directions with respect to the plane. In the crystal, mol­ecules are linked by weak C—H...O hydrogen bonds, forming a three-dimensional network.

1-(Prop-2-en-1-yl)-3-{[3-(pyridin-4-yl)-4,5-di­hydro­isoxazol-5-yl]meth­yl}-1H-anthra[1,2-d]imidazole-2,6,11(3H)-trione

The fused five- and three six-membered rings of the anthra[1,2-d]imidazole­trione part of the title compound, C₂₇H₂₀N₄O₄, show two different substituents at the imidazole N atoms, viz. an allyl group and a [3-(pyridin-4-yl)-4,5-di­hydro­isoxazol-5-yl]methyl group. The fused-ring system is approximately planar [r.m.s. deviation = 0.232 (2) Å], but is slightly buckled along the common edge of the two pairs of adjacent rings, with a dihedral angle between them of 11.17 (6)°. The isoxazole ring makes dihedral angles of 27.2 (2) and 12.7 (2)° with the imidazole and pyridine rings, respectively. Weak C—H...O and C—H...N hydrogen bonds ensure the cohesion of the crystal structure, forming a three-dimensional network.

3-Benzyl-6-bromo-1H-imidazo[4,5-b]pyridin-2(3H)-one

The fused imidazole and pyridine rings in the title compound, C₁₃H₁₀BrN₃O, are linked to a benzyl group. The fused ring system is essentially planar, the largest deviation from the mean plane being 0.006 (2) Å. The phenyl ring is not coplanar with the fused ring system, as indicated by the dihedral angle of 67.04 (12)°. In the crystal, mol­ecules are linked by pairs of N—H...O hydrogen bonds, forming inversion dimers.