Aqua­cyanido{6,6′-dimeth­oxy-2,2′-[1,2-phenyl­enebis(nitrilo­methanylyl­idene)]diphenolato}cobalt(III) acetonitrile hemisolvate

In the title complex, [Co(C₂₂H₁₈N₂O₄)(CN)(H₂O)]·0.5CH₃CN, the Co^III cation is N,N′,O,O′-chelated by a 6,6′-dimeth­oxy-2,2′-[1,2-phenyl­enebis(nitrilo­methanylyl­idene)]diphenolate dianion, and is further coordinated by a cyanide anion and a water mol­ecule in the axial sites, completing a distorted octa­hedral coordination geometry. In the crystal, pairs of bifurcated O—H...(O,O) hydrogen bonds link adjacent mol­ecules, forming centrosymmetric dimers. The acetonitrile solvent mol­ecule shows 0.5 occupancy.

rac-7,7',9,9'-Tetra­phenyl-9a,9a'-bi(7,8,9,9a-tetra­hydro-6aH-penta­leno[1,2,3-ij]naphthalen-8-one)

The racemic title compound, C₅₄H₃₈O₂, consists of two C-linked penta­leno[1,2,3-ij]naphthalenone moieties, the crowded aryl ring substitution on the cyclo­pentane rings forcing the two segments to assume a conformation which has pseudo-twofold rotational symmetry, with a dihedral angle between the naphthalene substituent groups of 55.30 (8)°. In each segment, the two phenyl rings have different conformational orientations, with inter-ring dihedral angles of 34.7 (2) and 49.63 (16)°. Each cyclo­pentane ring has the same relative configuration in its four chiral centres and together with the fused naphthalene ring assumes an overall chair-like conformation.

Dimethyl­ammonium 5-carb­oxy-2-(1-oxo-1λ⁵-pyridin-2-yl)-1H-imidazole-4-car­box­yl­ate

In the title salt, C₂H₈N⁺·C₁₀H₆N₃O₅⁻, the imidazole­carboxyl­ate anion is essentially planar [maximum deviation from the least-squares plane = 0.046 (5) Å], with a dihedral angle between the rings of 2.7 (2)°. This conformation is maintained by the presence of both intra­molecular carb­oxy–carboxyl­ate O—H...O and imidazole–oxide N—H...O hydrogen bonds. Iin the crystal, cation–carboxyl­ate N—H...O and cation–imidazole N—H...N hydrogen bonds result in chains along the b axis.