Bis(2,1,3-benzoselenadiazole-κN)dibromidocopper(II)

In the title complex, [CuBr2(C6H4N2Se)2], the CuII ion is tetra­coordinated by two bromide anions and two N atoms in a distorted square-planar geometry. The two essentially planar 2,1,3-benzoselenadiazole ligands [maximum deviations = 0.012 (2) and 0.030 (2) Å] are approximately coplanar [dihedral angle = 6.14 (6)°]. In the crystal, short inter­molecular Se⋯Br, Se⋯N and N⋯N inter­actions are observed. These short inter­actions and inter­molecular C—H⋯Br hydrogen bonds link the complex mol­ecules into two-dimensional arrays parallel to the ac plane

(Z)-1,2-Dichloro-1,2-bis­(3-chloro­quinoxalin-2-yl)ethene

The title compound, C18H8Cl4N4, exists in a cis configuration with respect to the bridging C=C bond. The two essentially planar quinoxaline ring systems [maximum deviations = 0.012 (1) and 0.022 (1) Å] are inclined at an angle of 59.84 (3). In the crystal, adjacent mol­ecules are linked into chains propagating along [001] via inter­molecular C—H⋯N hydrogen bonds. Weak inter­molecular π–π [centroid–centroid distance = 3.6029 (7)°] and C—H⋯π inter­actions are also observed

Adeninium perchlorate

In the title salt (systematic name: 6-amino-9H-purin-1-ium perchlorate), C5H6N5 +·ClO4 −, the adeninium cation is essentially planar, with a maximum deviation of 0.038 (1) Å. The whole of the perchlorate anion is disordered over two sets of sites with an occupancy ratio of 0.589 (13):0.411 (13). In the crystal, the adeninium cations are linked by pairs of N—H⋯N hydrogen bond into inversion dimers. The dimers and the anions are further inter­connected into a three-dimensional supra­molecular structure via inter­molecular N—H⋯O, C—H⋯O and C—H⋯N hydrogen bonds

1,2-Di-2-quinolylethene

The title compound, C20H14N2, comprises two crystallographically independent centrosymmetric mol­ecules (A and B) with different conformations due to the disorder of molecule B. The whole of mol­ecule B is disordered over two sets of positions, corresponding to a 180° rotation of the molecule, with a site-occupancy ratio of 0.780 (6):0.220 (6). The minor component of the disordered part in B has the same configuration as mol­ecule A, but the major component is different. The dihedral angle between the planes of mol­ecule A and mol­ecule B (major component) is 63.22 (3)°. The crystal structure is stabilized by inter­molecular C—H⋯π inter­actions

5-Bromo-5-bromo­methyl-2-phen­oxy-1,3,2-dioxaphospho­rinan-2-one

In the title 1,3,2-dioxaphospho­rinane derivative, C10H11Br2O4P, the 1,3,2-dioxaphospho­rinane ring adopts a chair conformation, having the P=O bond equatorially oriented and the phen­oxy group axially oriented. The bromo substituent is in an axial position opposite to the phen­oxy group and the bromo­methyl group is in an equatorial position opposite to the P=O bond. In the crystal packing, mol­ecules are linked through weak C—H⋯O and C—H⋯Br inter­actions to form chains along the b axis. The chains are arranged into sheets parallel to the ab plane. In adjacent sheets, mol­ecules are arranged in an anti­parallel fashion. Inter­molecular C—H⋯π inter­actions are also observed

2-Iodo-N-(6-methyl-2-pyrid­yl)benzamide

The asymmetric unit of the title compound, C13H11IN2O, comprises two crystallographically independent mol­ecules. The dihedral angles between the ring planes are 53.56 (9) and 72.14 (19)° in the two molecules. Pairs of inter­molecular N—H⋯N hydrogen bonds and I⋯O inter­actions link neighbouring mol­ecules into two different pairs of dimers, those involving N—H⋯N interactions having R 2 2(8) ring motifs. Short inter­molecular I⋯O [3.1458 (15) Å] and I⋯N [3.4834 (16) Å] contacts are present. The crystal structure is further stabilized by inter­molecular C—H⋯π inter­actions [3.565 (2) and 3.629 (2) Å]

3,5-Dichloro-6-methyl­pyridin-2-amine

In the title compound, C6H6Cl2N2, intra­molecular N–H⋯Cl and C—H⋯Cl contacts generate five-membered rings, producing S(5) ring motifs. Pairs of inter­molecular N—H⋯N hydrogen bonds link neighbouring mol­ecules into dimers with R 2 2(8) ring motifs. In the crystal structure, these dimers are connected by N—H⋯Cl inter­actions and are packed into columns

2-(1,3-Dithian-2-yl)-1,3-dithiane-2-carbaldehyde

The asymmetric unit of the title compound, C9H14OS4, comprises two crystallographically independent mol­ecules with similar conformations. In each mol­ecule, an intra­molecular C—H⋯O hydrogen bond generates a six-membered ring, producing an S(6) ring motif. All of the six-membered dithia­cyclo­hexane rings adopt chair conformations. The crystal structure is stabilized by four inter­molecular C—H⋯O and one C—H⋯S inter­action

2-(4-Nitro­phen­yl)-1,3-dithiane

The nitro group in the title compound, C10H11NO2S2, is almost coplanar with the benzene ring, making a dihedral angle of 3.42 (8)°. The 1,3-dithiane ring adopts a chair conformation. The crystal structure is stabilized by inter­molecular C—H⋯O and C—H⋯π [C⋯Cg = 3.4972 (10) Å] inter­actions

1,10-Phenanthroline–dithio­oxamide (2/1)

The asymmetric unit of the title compound, C12H8N2·0.5C2H4N2S2, contains one 1,10-phenanthroline mol­ecule and a half-mol­ecule of dithio­oxamide, which lies across a crystallographic inversion center. The 1,10-phenanthroline unit is not strictly planar, with dihedral angles between the central benzene ring and the pyridine rings of 1.42 (10) and 1.40 (10)°. In the crystal structure, two 1,10-phenanthroline mol­ecules are linked together by one dithio­oxamide via inter­molecular N—H⋯N hydrogen bonds