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5-Bromo-N-phenyl-pyrazine-2,3-diamine.

ABSTRACT: In the title compound, C(10)H(9)BrN(4), the dihedral angle between the benzene and pyrazine rings is 61.34?(5)°. Inter-molecular N-H?N hydrogen bonds and N-H?? inter-actions assemble the mol-ecules into a three-dimensional network structure.

SUBMITTER: Zhu X

PROVIDER: S-EPMC2977195 | biostudies-literature | 2009 Jul

REPOSITORIES: biostudies-literature

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5-Bromo-N-phenyl-pyrazine-2,3-diamine.

Zhu Xiaohui X

Acta crystallographica. Section E, Structure reports online 20090725 Pt 8

In the title compound, C(10)H(9)BrN(4), the dihedral angle between the benzene and pyrazine rings is 61.34 (5)°. Inter-molecular N-H⋯N hydrogen bonds and N-H⋯π inter-actions assemble the mol-ecules into a three-dimensional network structure. ...[more]

PMID: 21583644

Similar Datasets

Crystal structures of 2,3-bis-(thio-phen-2-yl)pyrido[2,3-b]pyrazine and 7-bromo-2,3-bis-(thio-phen-2-yl)pyrido[2,3-b]pyrazine.

Project description:The crystal structures of 2,3-bis-(thio-phen-2-yl)pyrido[2,3-b]pyrazine, C15H9N3S2 (1), and 7-bromo-2,3-bis-(thio-phen-2-yl)pyrido[2,3-b]pyrazine, C15H8BrN3S2 (2), are discussed. Both mol-ecules crystallize in space group P21/c. In 1, the thienyl rings are inclined to the mean plane of the pyrido-pyrazine moiety by 6.16?(7) and 86.66?(8)°, where as in 2 the corresponding dihedral angles are 33.29?(11) and 19.84?(9)°. The pyrido-pyrazine moiety is relatively planar in 1 with the two rings being inclined to each other by 1.33?(7)°. In 2, however, the pyrido-pyrazine moiety is buckled with the corresponding dihedral angle being larger at 8.78?(10)°. In the crystal of 1, the packing creates inter-secting bilayers; the layering results from the pyrido-pyrazine moieties being engaged in offset ?-stacking, where the inter-planar distance is 3.431?(9)?Å with an offset 1.14?Å. In the crystal of 2, the mol-ecules pack head-to-head and are linked by a series of C-H?Br and C-H?N inter-molecular inter-actions, forming layers parallel to the ab plane.

| S-EPMC6323875 | biostudies-other

4,6-Di-bromo-N-{3-[(4,6-di-bromo-2,3-di-methyl-phenyl)imino]butan-2-yl-idene}-2,3-di-methyl-aniline.

Project description:The title compound, C20H20Br4N2, is a product of the condensation reaction of 4,6-di-bromo-2,3-di-methyl-aniline and butane-2,3-dione. The mol-ecule has a center of symmetry at the mid-point of the central C-C bond. The dihedral angle between the benzene ring and the 1,4-di-aza-butadiene plane is 78.3?(2)°. Niether hydrogen bonding nor aromatic stacking is observed in the crystal structure.

| S-EPMC3790371 | biostudies-literature

Pyridine-2,3-diamine.

Project description:The mol-ecule of the title pyridine derivative, C(5)H(7)N(3), shows approximately non-crystallographic C(s) symmetry. Intra-cyclic angles cover the range 117.50?(14)-123.03?(15)°. In the crystal, N-H?N hydrogen bonds connect mol-ecules into a three-dimensional network. The closest inter-centroid distance between two ?-systems occurs with the c-axis repeat at 3.9064?(12)?Å.

| S-EPMC3213591 | biostudies-literature

5,6-Dimethyl-pyrazine-2,3-dicarbonitrile.

Project description:The asymmetric unit of the title compound, C(8)H(6)N(4), contains two almost planar independent mol-ecules (r.m.s. deviations = 0.026 and 0.030?Å). The crystal studied was a non-merohedral twin with the components in a 0.513?(2):0.487?(2) ratio.

| S-EPMC3515305 | biostudies-literature

5,6-Diphenyl-pyrazine-2,3-dicarbonitrile.

Project description:In the title compound, C(18)H(10)N(4), the pyrazine ring is oriented at dihedral angles of 48.08 (7) and 44.80 (7)° with respect to the phenyl rings, while the dihedral angle between the phenyl rings is 49.47 (7)°. In the crystal structure, weak π-π contacts between pyrazine and phenyl rings [centroid-centroid distance = 3.813 (1) Å] may stabilize the structure.

| S-EPMC2970004 | biostudies-literature

Bis(triethyl-ammonium) bis-(μ-pyrazine-2,3-dithiol-ato)bis-(pyrazine-2,3-dithio-lato)diferrate(III) methanol disolvate.

Project description:In the title compound, (C(6)H(16)N)(2)[Fe(2)(C(4)H(2)N(2)S(2))(4)]·2CH(4)O, the [Fe(III)(pdt)(2)](-) anion (pdt is pyrazine-2,3-dithiol-ate) forms a centrosymmetric dimer supported by two Fe(III)-S bonds [Fe-S = 2.4787 (4) Å]. In the crystal structure, dimers form a one-dimensional stack along the b axis via π-π stacking inter-actions, the inter-planar separation between adjacent dimers being 3.51 (2) Å. The methanol solvent mol-ecule is involved in two hydrogen bonds in which the hydroxyl group acts as a hydrogen-bond donor to the N atom of a pdt ligand and the O atom acts as an acceptor for the NH group of the triethyl-ammonium cation.

| S-EPMC2967914 | biostudies-literature

Bis(2,3-dimethyl-butane-2,3-diamine)nickel(II) dinitrate monohydrate.

Project description:In the title compound, [Ni(C(6)H(16)N(2))(2)](NO(3))(2)·H(2)O, the bis-(2,3-dimethyl-butane-2,3-diamine)nickel(II) complex cation possesses a relatively undistorted square-planar geometry about the Ni atom, which lies on an inversion centre and is coordinated by four N atoms from two symmetry-related 2,3-diamino-2,3-dimethyl-butane (tmen) ligands. The amine groups are N-H⋯O hydrogen bonded to the nitrate anions, which are, in turn, linked by inter-stitial water mol-ecules lying on a twofold axis. The infinite zigzag chains thus formed along [001] are further connected to each other by N-H⋯O hydrogen bonds towards the water mol-ecules, forming layers of two-dimensional hydrogen-bonded arrays.

| S-EPMC2977546 | biostudies-literature

2,3-Bis(thio-phen-2-yl)pyrazine-[2,3-f][1,10]phenanthroline.

Project description:The mol-ecule of the title compound, C(22)H(12)N(4)S(2), shows no crystallographic symmetry. The thiophene rings form different dihedral angles [40.15 (9) and 15.43 (10)°] with the pyrazine ring. A strong π-π stacking inter-action occurs between adjacent pyrazine-[2,3-f][1,10]phenanthroline units with an inter-planar distance of 3.4352 (16) Å.

| S-EPMC3344560 | biostudies-literature

2,3-Dibromo-3-(2-bromo-phen-yl)-1-(3-phenyl-sydnon-4-yl)propan-1-one.

Project description:IN THE TITLE COMPOUND [SYSTEMATIC NAME: 2,3-dibromo-3-(2-bromo-phen-yl)-1-(5-oxido-3-phenyl-1,2,3-oxadiazol-3-ium-4-yl)propan-1-one], C(17)H(11)Br(3)N(2)O(3), the oxadiazole ring is essentially planar, with a maximum deviation of 0.003?(1)?Å. The -CHBr-CHBr- chain and bromo-phenyl ring are disordered over two sets of sites with a refined occupany ratio of 0.756?(5):0.244?(5). The central oxadiazole ring makes dihedral angles of 54.07?(11) and 13.76?(18)° with the attached phenyl and the major component of the bromo-substituted benzene rings, respectively. The dihedral angle between the major and minor components of the bromo-phenyl rings is 13.4?(5)°. In the crystal structure, mol-ecules are connected by C-H?O hydrogen bonds, forming [010] ribbons.

| S-EPMC3011624 | biostudies-literature

5,6-Di-2-thienyl-2,3-dihydro-pyrazine.

Project description:In the title compound, C(12)H(10)N(2)S(2), which was synthesized by the reaction of 2,2'-thenil and ethyl-enediamine, the dihedral angle between the two thio-phene rings is 66.33?(9)°. In the crystal structure, inter-molecular C-H?N hydrogen bonds link the mol-ecules into infinite chains along the b axis and weak C-H?? inter-actions may further stabilize the structure.

| S-EPMC2979149 | biostudies-literature

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