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The title compound, C20H12Br2N2, was prepared by the reaction of 1-(3-bromophenyl)-2-(4-bromophenyl)ethane-1,2-dione with o-phenylenediamine in refluxing ethanol. In the molecule, all bond lengths and angles are within normal ranges. The dihedral angle between the two benzene rings is 34.89 (1)°. The dihedral angles between the benzene rings and the quinoxaline system are 57.23 (1) and 36.75 (1)°. The crystal packing is stabilized by van der Waals forces.

p-Hydroxybenzoic acid (p-HOBA) was selected as the building block for self-assembly with five bases, i.e., diethylamine, tert-butylamine, cyclohexylamine, imidazole and piperazine, and generation of the corresponding acid–base complexes 1–5. Crystal structure analyses suggest that proton-transfer from the carboxyl hydrogen to the nitrogen atom of the bases can be observed in 1–4, while only in 5 does a solvent water molecule co-exist with p--HOBA and piperazine. With the presence of O–H···O hydrogen bonds in 1–4, the deprotonated p-hydroxybenzoate anions (p-HOBAA–) are simply connected each other in a head-to-tail motif to form one-dimensional (1D) arrays, which are further extended to distinct two-dimensional (2D) (for 1 and 4) and three-dimensional (3D) (for 2 and 3) networks via N–H···O interactions. While in 5, neutral acid and base are combined pair-wise by O–H···N and N–H···O bonds to form a 1D tape and then the 1D tapes are sequentially combined by water molecules to create a 3D network. Some interlayer or intralayer C–H···O, C–H···p and p×××p interactions help to stabilize the supramolecular buildings. Melting point determination analyses indicate that the five acid–base complexes are not the ordinary superposition of the reactants and they are more stable than the original reactants.

The title compound, C18H18N2O, was prepared by the reaction of 3-phenyl-1-( p-tol­yl)prop-2-en-1-one with hydrazine hydrate in acetic acid. The pyrazole ring is in an envelope conformation. The crystal packing is stabilized by van der Waals forces. [ABSTRACT FROM AUTHOR]

The title compound, C12H13NO2S, was prepared by the reaction of acetyl­acetone with phenyl isothio­cyanate. In addition to the intra­molecular O—H⋯O hydrogen bond, there is a weak inter­molecular N—H⋯S hydrogen bond, which links the mol­ecules into chains extended along the c axis. The crystal packing is further stabilized by van der Waals forces. [ABSTRACT FROM AUTHOR]

The title compound, C13H12N2OS, was prepared by the reaction of (4-pyrid­yl)methanol with phenyl isothio­cyanate and NaOH in a 1,4-dioxane solution. The asymmetric unit contains two independent mol­ecules. The mol­ecular structure and packing are stabilized by N—H⋯N inter­molecular hydrogen-bond inter­actions and C—H⋯π inter­actions. [ABSTRACT FROM AUTHOR]

In the title compound, [Co(C8H8NO2)2], the Co atom has a distorted square-planar coordination involving two N atoms and two O atoms from two ethanone 1-(2-hydroxy­phen­yl)oximato ligands. The mol­ecular structure and packing are stabilized by intra­molecular O—H⋯O hydrogen bonds and C—H⋯π inter­molecular inter­action. [ABSTRACT FROM AUTHOR]

The title compound, [Cu2Cl2(C18H15O3P)4], is a centrosymmetric dinuclear complex, where each CuI atom has a distorted tetra­hedral coordination involving two triphenyl­phosphite ligands and two bridging Cl− anions. The mol­ecular structure and packing are stabilized by C—H⋯O and C—H⋯π inter­actions. [ABSTRACT FROM AUTHOR]

In the title compound, [Cd(N3)2(C10H8N2)2], the cadmium(II) ion is coordinated by two N atoms from two azide groups and four N atoms from two 2,2′-bi­pyridine ligands. The coordin­ation geometry of the cadmium(II) ion is distorted octahedral. The packing is stabilized by intermolecular C—H⋯N hydrogen-bond interactions. [ABSTRACT FROM AUTHOR]

The title compound, C15H16N2S, was prepared by the reaction of 3,5-dimethylphenylamine with 1-isothiocyanatobenzene. In the molecule, all bond lengths and angles are within normal ranges. The dihedral angle between the two aromatic rings is 48.77 (1)°. The crystal packing is stabilized by van der Waals forces. [ABSTRACT FROM AUTHOR]

In the title structure, C21H16BrClN2, the pyrazoline ring is approximately coplanar with the N-substituted phenyl ring. The dihedral angles formed by the pyrazoline ring with the 4-chloro­phenyl and 4-bromo­phenyl rings are 78.82 and 10.9°, respectively. [ABSTRACT FROM AUTHOR]

The title compound, C11H10N6S, was prepared by the reaction of ethyl 2-(1 H-1,2,4-triazol-1-yl)­acetate with hydrazine and phenyl iso­thio­cyanate. The molecular structure and packing are stabilized by an N—H⋯N intermolecular hydrogen-bond and C—H⋯π interactions. [ABSTRACT FROM AUTHOR]

The title compound, C13H9ClN2, was prepared by reaction of o-phenyl­enediamine with 4-chloro­benzaldehyde under reflux in ethanol. The mol­ecules are linked by N—H⋯N inter­actions. [ABSTRACT FROM AUTHOR]

The title compound, C20H14C12N2, was prepared by reaction of o-phenylenediamine with 2-chlorobenzaldehyde under reflux in ethanol. The crystal structure is stabilized by van der Waals interactions. [ABSTRACT FROM AUTHOR]

The title compound, [Pd(C14H12O2P)2]·CH2Cl2, consists of mononuclear [(Ph2PCH2COO)2Pd] complexes and dichloro­methane mol­ecules in a 1:1 molar ratio. The two (diphenyl­phosphino)acetate ligands are coordinated to the central Pd atom by their P and O atoms, forming five-membered chelate rings. The PdII atom has a distorted square-planar configuration [Pd—O = 2.076 (3) and 2.082 (3) Å, and Pd—P = 2.214 (1) and 2.216 (1) Å]. [ABSTRACT FROM AUTHOR]

In the title compound, [Co(NCS)2(C4H6N2)2], each cobalt(II) ion is coordinated by two N atoms from two 2-methyl-1 H-imidazole ligands and two N atoms from two iso­thio­cyanate groups. The Co atom lies on a mirror plane and adopts a slightly distorted tetrahedral coordination. The molecular structure and packing are stabilized by intramolecular and intermolecular hydrogen-bond interactions. [ABSTRACT FROM AUTHOR]

In the title compound, C13H11N3OS2, the dihedral angles between the planes of the triazole and phenyl rings and that through the four NC3 atoms of the C=C are 76. (1) and 57.6 (1)°, respectively. There are some intermolec­ular interactions in the crystal structure. [ABSTRACT FROM AUTHOR]

The title compound, C9H11N3O2, was prepared by the reaction of 1-(2-nitro­phen­yl)hydrazine with acetone at room temperature. The mol­ecule is approximately planar and exhibits a weak intra­molecular hydrogen-bond inter­action. [ABSTRACT FROM AUTHOR]