organic compounds
Open access
In the title compound, C15H15N5O4, a nitroformazan derivative, the formazan unit is essentially planar with an r.m.s. deviation of 0.0204 (6) Å and adopts a closed syn,s-cis configuration with an intramolecular N—HN hydrogen bond. The formazan plane makes dihedral angles of 4.32 (5) and 24.35 (5)° with the benzene rings. The dihedral angle between the formazan plane and the nitro group is 12.58 (8)°. In the crystal, C—HO interactions connect the molecules into an inversion dimer.
organic compounds
Open access
The title compound [systematic name: (E)-2-hydroxy-5-(phenyldiazenyl)cyclohepta-2,4,6-trien-1-one], C13H10N2O2, is essentially planar with an r.m.s. deviation of 0.036 (2) Å and a dihedral angle of 1.57 (8)° between the phenyl and tropolone rings. In the crystal, molecules are linked by pairs of O—HO hydrogen bonds into inversion dimers. The dimers are further connected by C—HO hydrogen bonds and π–π stacking interactions, with centroid–centroid distances of 3.6934 (9) and 3.6282 (9) Å.
metal-organic compounds
Open access
The CuI atom in the title compund, [Cu(C7H2Br3O2)(C19H17P)2], is located on a twofold rotation axis; the 3,5,7-tribromotropolonate anion coordinates as a bidentate ligand with a bite angle of 76.42 (9)°. An intramolecular C—HO interaction occurs. Within the crystal, extensive weak C—Hπ interactions contribute to the herringbone pattern observed in the packing of the molecules.
metal-organic compounds
Open access
In the title complex, [Cu(NO3)(C18H12F3P)3], the ligating atoms define a distorted tetrahedon with the three tris(4-fluorophenyl)phosphane ligands in the basal positions and the nitrate ligand in the axial position. The intramolecular π–π interaction [centroid–centroid distance = 3.6113 (11) Å] between two of the 4-fluorophenyl groups is complemented by both C—HF and C—HO interactions with distances in the range 2.51–2.60 Å, resulting in a tight head-to-tail packing.
organic compounds
Open access
The title compound, C29H26O4, is essentially planar in the acetophenone portion that includes both the hydroxy and a benzyloxy O atoms, with an r.m.s. deviation of 0.0311 Å. The other two substituents intersect the plane at 70.45 (3) and 59.55 (4)°. In the molecule there is an intramolecular O—HO hydrogen bond. In the crystal, molecules are linked by C—HO hydrogen bonds, as well as C—Hπ and π-stacking interactions, with centroid–centroid distances 3.6570 (2) Å.