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N,N'-Bis(pyridin-2-yl)benzene-1,4-diamine-quinoxaline (2/1).

ABSTRACT: The asymmetric unit of the title compound, 2C(16)H(14)N(4)·C(8)H(6)N(2), consits of one mol-ecule of N,N'-bis-(pyridin-2-yl)benzene-1,4-diamine (PDAB) and one half-mol-ecule of quinoxaline (QX) that is located around an inversion centre and disordered over two overlapping positions. The PDAB mol-ecule adopts a non-planar conformation with an E configuration at the two partially double exo C N bonds of the 2-pyridyl-amine units. In the crystal, these self-complementary units are N-H⋯N hydrogen bonded via a cyclic R(2) (2)(8) motif, creating tapes of PDAB mol-ecules extending along [010]. Inversion-related tapes are arranged into pairs through π-π stacking inter-actions between the benzene rings [centroid-centroid distance = 3.818 (1) Å] and the two symmetry-independent pyridine groups [centroid-centroid distance = 3.760 (1) Å]. The QX mol-ecules are enclosed in a cavity formed between six PDAB tapes.

SUBMITTER: Wicher B

PROVIDER: S-EPMC3238910 | biostudies-literature |

REPOSITORIES: biostudies-literature

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N,N'-Bis(pyridin-2-yl)benzene-1,4-diamine-naphthalene (2/1).

Project description:The asymmetric unit of the title compound, C(10)H(8)·2C(16)H(14)N(4), consists of one mol-ecule of N,N'-bis-(pyridin-2-yl)benzene-1,4-diamine (PDAB) and one half of the centrosymmetric naphthalene mol-ecule. The PDAB mol-ecule adopts a non-planar conformation with an E configuration at the two partially double exo C N bonds of the 2-pyridyl-amine units. In the crystal, N-H⋯N hydrogen bonds between the PDAB mol-ecules generate a cyclic R(2) (2)(8) motif, leading to the formation of PDAB tapes extending along [100]. The tapes are arranged into (010) layers and the naphthalene mol-ecules are enclosed in cavities formed between the PDAB layers.

| S-EPMC3238953 | biostudies-literature

A third polymorph of N,N'-bis-(pyridin-2-yl)benzene-1,4-diamine.

Project description:A third polymorph of the title compound, C(16)H(14)N(4), has been obtained. The mol-ecule adopts a non-planar conformation with an E configuration at the two partially double exo C N bonds of the 2-pyridyl-amine units. Like in the triclinic form [Bensemann et al. (2002 ?). New J. Chem.26, 448-456], the recognition process between 2-pyridyl-amine units takes place through formation of a cyclic R(2) (2)(8) hydrogen-bond motif, leading to the creation of tapes parallel to [001].

| S-EPMC3247481 | biostudies-literature

Tetra-aqua-bis-[N,N'-bis-(pyridin-3-yl-methyl-idene)benzene-1,4-diamine]-zinc dinitrate 1.49-hydrate.

Project description:In the title compound, [Zn(C(18)H(14)N(4))(2)(H(2)O)(4)](NO(3))(2)·1.49H(2)O, the Zn(II) atom, lying on an inversion center, is coordinated by two N atoms from two N,N'-bis-(pyridin-3-yl-methyl-idene)benzene-1,4-diamine ligands and four water mol-ecules in a distorted octa-hedral geometry. The nitrate anion is disordered over two sets of sites, with an occupancy ratio of 0.744?(4):0.256?(4). The uncoordinated water mol-ecule is also disordered with an occupancy factor of 0.744?(4). O-H?O and O-H?N hydrogen bonds link the complex cations, nitrate anions and uncoordinated water mol-ecules into a supra-molecular layer parallel to (102).

| S-EPMC3238659 | biostudies-literature

A centrosymmetric monoclinic polymorph of N,N-bis-(pyridin-3-yl-methyl-idene)benzene-1,4-diamine.

Project description:The complete molecule of the title compound, C(18)H(14)N(4), is generated by the application of a centre of inversion. The dihedral angle between the central benzene ring and the pyridine ring is 31.88 (7)°. In the crystal, mol-ecules are stacked in columns along the c axis and several inter-molecular π-π inter-actions are present between the six-membered rings, the shortest centroid-centroid distance being 3.937 (2) Å. The structure reported herein represents a centrosymmetric polymorph of the previously reported non-centrosymmetric (P2(1)) form [Kim et al. (2005 ▶). Bull. Korean Chem. Soc.26, 892-898].

| S-EPMC3200937 | biostudies-literature

N,N'-Bis(pyridin-2-yl)benzene-1,4-dicarboxamide.

Project description:Mol-ecules of the title compound, C(18)H(14)N(4)O(2), are located around an inversion center and connected into chains in the crystal via inter-molecular N-H?N hydrogen bonds generating an R(2) (2)(8) motif.

| S-EPMC3050221 | biostudies-literature

N,N'-Bis[1-(pyridin-2-yl)-ethyl-idene]benzene-1,4-diamine.

Project description:In the title compound, C(20)H(18)N(4), the benzene ring lies about an inversion center. The central benzene-1,4-diamine unit is connected to two pyridine rings by the C=N imine bonds. The dihedral angle between the benzene and pyridine rings is 82.9?(1)°.

| S-EPMC3393902 | biostudies-other

catena-Poly[[bis-(nitrato-?O)cadmium]bis-[?-1,4-bis-(pyridin-3-yl-meth-oxy)benzene-?N:N']].

Project description:In the title compound, [Cd(NO(3))(2)(C(18)H(16)N(2)O(2))(2)](n), the six-coordinated Cd(II) ion is located on an inversion center and has a distorted octa-hedral environment defined by four N atoms from four 1,4-bis-(pyridin-3-ylmeth-oxy)benzene ligands and two O atoms from two nitrate anions. The ligands link the Cd(II) ions into a ribbon-like structure running along [201]. One O atom of the nitrate anion is disordered over two positions with site-occupancy factors of 0.59?(2) and 0.41?(2).

| S-EPMC3200741 | biostudies-literature

N,N'-Bis(2-thienylmethyl-ene)benzene-1,4-diamine.

Project description:The Schiff base, C(16)H(12)N(2)S(2), has been synthesized by refluxing an ethano-lic solution of thio-phene-2-carbaldehyde and benzene-1,4-diamine. The center of the benzene ring is located on a crystallographic center of inversion. The dihedral angle between the benzene and thio-phene rings is 63.6?(1)°.

| S-EPMC2970153 | biostudies-literature

catena-Poly[[dichloridomercury(II)]-?-1,4-bis-[(pyridin-2-yl)meth-oxy]benzene-?N:N'].

Project description:In the title compound, [HgCl(2)(C(18)H(16)N(2)O(2))](n), the Hg(II) atom is four-coordinated in a distorted tetra-hedral environment defined by two Cl atoms and two N atoms from two 1,4-bis-(pyridin-2-ylmeth-oxy)benzene ligands. The ligand shows a non-coplanar conformation, in which the dihedral angles between the two terminal pyridine rings and the linking benzene ring are 7.275?(17) and 74.020?(14)°. The flexible ligands link the Hg(II) atoms into a chain running along [010], with an Hg?Hg separation of 10.335?(5)?Å, which is equal to the b axis. The chains are connected by C-H?O and C-H?Cl hydrogen bonds.

| S-EPMC3201560 | biostudies-literature

1,4-Bis(fluoro-meth-yl)benzene.

Project description:The title compound, C(8)H(8)F(2), lies across a crystallographic inversion centre. The structure features short C?F [2.8515?(18)?Å] and F?F [2.490?(4)?Å] contacts, which are significantly shorter than the sum of the van der Waals radii of these atoms. The F atom and methyl-ene H atoms are disordered over two positions with a site-occupancy ratio of 0.633?(3):0.367?(3). In the crystal structure, inter-molecular C-H?F inter-actions link neighboring mol-ecules into infinite chains along the b axis. In addition, C-H?? inter-actions link these mol-ecules along [10], forming a two-dimensional network parallel to (101).

| S-EPMC2968459 | biostudies-literature

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