metal-organic compounds
Open access
The CuII atom in the title compound, [Cu(C16H10ClN2O)2], is located on an inversion center and is tetracoordinated by two N and two O atoms from two bidentate 1-[(E)-(2-chlorophenyl)diazenyl]naphthalen-2-olate ligands, forming a square-planar complex. In the crystal, molecules are linked via weak C—HO and C—HCl hydrogen bonds, forming chains propagating along [010]. There are also π–π interactions present involving adjacent naphthalene rings [centroid–centroid distance = 3.661 (13) Å].
organic compounds
Open access
The title compound, C18H14N2O2, crystallized with two independent zwitterion molecules (A and B) in the asymmetric unit. They are both close to planar, the dihedral angle between the benzene ring and naphthalene ring system being 4.30 (9)° in A and 4.69 (9)° in B. Each molecule has an E conformation with respect to the azo double bond. In each of the independent molecules, an intramolecular N—HO hydrogen bond forms an S(6) ring motif. In the crystal, molecules are linked via C—HO hydrogen bonds, forming –A—A—A– and –B—B—B– chains parallel to one another and propagating along the a-axis direction. There are also π–π interactions between adjacent molecules involving benzene and naphthalene rings [centroid–centroid distance of 3.626 (3) Å for adjacent A molecules and 3.652 (3) Å for adjacent B molecules].
organic compounds
Open access
There are two independent zwitterion molecules (A and B) in the asymmetric unit of the title compound, C17H11N3O, which belongs to the family of azo dyes. The dihedral angle between the benzene ring and the naphthalene ring system is 6.99 (6)° in molecule A and 4.38 (6)° in molecule B. The azo group adopts an E conformation with respect to the –N=N– bond and each of the independent molecules has an intramolecular N—HO hydrogen bond. In the crystal, molecules are linked by C—HO and C—HN hydrogen bonds, forming ribbons propagating along [-110]. The ribbons are linked via π–π interactions involving the benzene and naphthalene rings of inversion-related A and inversion-related B molecules, forming a three-dimensional structure. The most significant centroid–centroid distances vary from 3.6599 (6) to 3.7538 (9) Å.