Download citation
Download citation

link to html
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—H...N 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—H...O inter­actions connect the mol­ecules into an inversion dimer.

Download citation
Download citation

link to html
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—H...O hydrogen bonds into inversion dimers. The dimers are further connected by C—H...O hydrogen bonds and π–π stacking inter­actions, with centroid–centroid distances of 3.6934 (9) and 3.6282 (9) Å.

Download citation
Download citation

link to html
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—H...O inter­action occurs. Within the crystal, extensive weak C—H...π inter­actions contribute to the herringbone pattern observed in the packing of the mol­ecules.

Download citation
Download citation

link to html
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—H...F and C—H...O inter­actions with distances in the range 2.51–2.60 Å, resulting in a tight head-to-tail packing.

Download citation
Download citation

link to html
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—H...O hydrogen bond. In the crystal, mol­ecules are linked by C—H...O hydrogen bonds, as well as C—H...π and π-stacking inter­actions, with centroid–centroid distances 3.6570 (2) Å.
Follow Acta Cryst. E
Sign up for e-alerts
Follow Acta Cryst. on Twitter
Follow us on facebook
Sign up for RSS feeds