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].