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The title compound, C14H12N2O2, is non-planar. The dihedral angle between the two benzene rings is 32.1 (2)° and the nitro group is at an angle of 13.2 (2)° with respect to its attached benzene ring. In the crystal structure, the mol­ecules are stacked through π–π inter­actions. The stacks are arranged through π–π and C—H⋯π inter­actions, forming chains along [001], which are further connected by C—H⋯O and C—H⋯N hydrogen bonds, forming networks along [100]. The networks are connected by C—H⋯O hydrogen bonds along [010]. [ABSTRACT FROM AUTHOR]

The non-planar title mol­ecule, C15H10Cl2O, contains two benzene rings linked by a –CH=CH—C(=O)– bridge. In the crystal structure, the mol­ecules are paired through π–π inter­actions and the pairs are connected to each other via hydrogen-bonding inter­actions. [ABSTRACT FROM AUTHOR]

In the title salt, C14H14NO+·C24H20B−·C2H6OS, the cation is nearly planar and is totally disordered, each of the two positions being occupied equally. The crystal structure has an O—H⋯O hydrogen bond between the disordered cation and the dimeth­yl sulfoxide mol­ecule. A C—H⋯π inter­action between the disordered cation and a phen­yl ring of the tetra­phenyl­borate anion is also present. [ABSTRACT FROM AUTHOR]

In the cation of the title compound, C20H26N22+·2Cl−·CH4O, there is an approximate twofold rotation axis. All the four chiral centers are in the S configuration. All three six-membered rings in the central part of the cation adopt a boat conformation. Both chloride anions and the O atom in the solvent mol­ecule form hydrogen bonds with the cation, resulting in a chain along [010]. [ABSTRACT FROM AUTHOR]

The title compound, C17H19Cl2N2OS+·Cl−, was synthesized from 2-acetothio­phene, 1-(2,3-dichloro­phen­yl)piperazine and paraformaldehyde. In the cation, the thienyl ring is coplanar with the oxopropyl group. The protonated piperazine ring exhibits a chair conformation. In the crystal packing the cations are connected by C—H⋯O and C—H⋯Cl hydrogen bonds. [ABSTRACT FROM AUTHOR]