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4-Chloro-2-nitro-benzoic acid-pyrazine (2/1).

ABSTRACT: In the title co-crystal, 2C(7)H(4)ClNO(4)·C(4)H(4)N(2), the pyrazine mol-ecule is located on an inversion centre, so that the asymmetric unit consists of one mol-ecule of 4-chloro-2-nitro-benzoic acid and a half-mol-ecule of pyrazine. The components are connected by O-H?N and C-H?O hydrogen bonds, forming a 2:1 unit. In the hydrogen-bonded unit, the dihedral angle between the pyrazine ring and the benzene ring of the benzoic acid is 16.55?(4)°. The units are linked by inter-molecular C-H?O hydrogen bonds, forming a sheet structure parallel to ([Formula: see text]04). A C-H?O hydrogen-bond linkage is also observed between these sheets.

SUBMITTER: Gotoh K

PROVIDER: S-EPMC3238884 | biostudies-other | 2011 Dec

REPOSITORIES: biostudies-other

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4-Chloro-2-nitro-benzoic acid-pyrazine (2/1).

Gotoh Kazuma K Ishida Hiroyuki H

Acta crystallographica. Section E, Structure reports online 20111109 Pt 12

In the title co-crystal, 2C(7)H(4)ClNO(4)·C(4)H(4)N(2), the pyrazine mol-ecule is located on an inversion centre, so that the asymmetric unit consists of one mol-ecule of 4-chloro-2-nitro-benzoic acid and a half-mol-ecule of pyrazine. The components are connected by O-H⋯N and C-H⋯O hydrogen bonds, forming a 2:1 unit. In the hydrogen-bonded unit, the dihedral angle between the pyrazine ring and the benzene ring of the benzoic acid is 16.55 (4)°. The units are linked by inter-molecular C-H⋯O hydro ...[more]

PMID: 22199737

Similar Datasets

Crystal structures of four isomeric hydrogen-bonded co-crystals of 6-methyl-quinoline with 2-chloro-4-nitro-benzoic acid, 2-chloro-5-nitro-benzoic acid, 3-chloro-2-nitro-benzoic acid and 4-chloro-2-nitro-benzoic acid.

Project description:The structures of the four isomeric compounds of 6-methyl-quinoline with chloro- and nitro-substituted benzoic acids, C7H4ClNO4·C10H9N, namely, 2-chloro-4-nitro-benzoic acid-6-methyl-quinoline (1/1), (I), 2-chloro-5-nitro-benzoic acid-6-methyl-quinoline (1/1), (II), 3-chloro-2-nitro-benzoic acid-6-methyl-quinoline (1/1), (III), and 4-chloro-2-nitro-benzoic acid-6-methyl-quinoline (1/1), (IV), have been determined at 185-190 K. In each compound, the acid and base mol-ecules are linked by a short hydrogen bond between a carboxyl O atom and an N atom of the base. The O⋯N distances are 2.5452 (12), 2.6569 (13), 2.5640 (17) and 2.514 (2) Å, respectively, for compounds (I)-(IV). In the hydrogen-bonded acid-base units of (I), (III) and (IV), the H atoms are each disordered over two positions with O site:N site occupancies of 0.65 (3):0.35 (3), 0.59 (4):0.41 (4) and 0.48 (5):0.52 (5), respectively, for (I), (III) and (IV). The H atom in the hydrogen-bonded unit of (II) is located at the O-atom site. In all of the crystals of (I)-(IV), π-π inter-actions between the quinoline ring system and the benzene ring of the acid mol-ecule are observed. In addition, a π-π inter-action between the benzene rings of adjacent acid mol-ecules and a C-H⋯O hydrogen bond are observed in the crystal of (I), and C-H⋯O hydrogen bonds and O⋯Cl contacts occur in the crystals of (III) and (IV). These inter-molecular inter-actions connect the acid and base mol-ecules, forming a layer structure parallel to the bc plane in (I), a column along the a-axis direction in (II), a layer parallel to the ab plane in (III) and a three-dimensional network in (IV). Hirshfeld surfaces for the title compounds mapped over d norm and shape index were generated to visualize the weak inter-molecular inter-actions.

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Crystal structures of 3-chloro-2-nitro-benzoic acid with quinoline derivatives: 3-chloro-2-nitro-benzoic acid-5-nitro-quinoline (1/1), 3-chloro-2-nitro-benzoic acid-6-nitro-quinoline (1/1) and 8-hy-droxy-quinolinium 3-chloro-2-nitro-benzoate.

Project description:The structures of three compounds of 3-chloro-2-nitro-benzoic acid with 5-nitro-quinoline, (I), 6-nitro-quinoline, (II), and 8-hy-droxy-quinoline, (III), have been determined at 190 K. In each of the two isomeric compounds, (I) and (II), C7H4ClNO4·C9H6N2O2, the acid and base mol-ecules are held together by O-H⋯N and C-H⋯O hydrogen bonds. In compound (III), C9H8NO+·C7H3ClNO4 -, an acid-base inter-action involving H-atom transfer occurs and the H atom is located at the N site of the base mol-ecule. In the crystal of (I), the hydrogen-bonded acid-base units are linked by C-H⋯O hydrogen bonds, forming a tape structure along the b-axis direction. Adjacent tapes, which are related by a twofold rotation axis, are linked by a third C-H⋯O hydrogen bond, forming wide ribbons parallel to the (03) plane. These ribbons are stacked via π-π inter-actions between the quinoline ring systems [centroid-centroid distances = 3.4935 (5)-3.7721 (6) Å], forming layers parallel to the ab plane. In the crystal of (II), the hydrogen-bonded acid-base units are also linked into a tape structure along the b-axis direction via C-H⋯O hydrogen bonds. Inversion-related tapes are linked by further C-H⋯O hydrogen bonds to form wide ribbons parallel to the (08) plane. The ribbons are linked by weak π-π inter-actions [centroid-centroid distances = 3.8016 (8)-3.9247 (9) Å], forming a three-dimensional structure. In the crystal of (III), the cations and the anions are alternately linked via N-H⋯O and O-H⋯O hydrogen bonds, forming a 21 helix running along the b-axis direction. The cations and the anions are further stacked alternately in columns along the a-axis direction via π-π inter-actions [centroid-centroid distances = 3.8016 (8)-3.9247 (9) Å], and the mol-ecular chains are linked into layers parallel to the ab plane through these inter-actions.

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2-Chloro-4-nitro-benzoic acid-quinoline (1/1).

Project description:In the title compound, C(7)H(4)ClNO(4)·C(9)H(7)N, the two components are connected by an O-H?N hydrogen bond. In the hydrogen-bonded unit, the dihedral angle between the quinoline ring system and the benzene ring of benzoic acid is 3.15?(7)°. In the crystal, units are linked by inter-molecular C-H?O hydrogen bonds, forming a tape along the c axis. The tapes are stacked along the b axis through a C-H?O hydrogen bond into a layer parallel to the bc plane.

| S-EPMC3247614 | biostudies-literature

Crystal structures of the two isomeric hydrogen-bonded cocrystals 2-chloro-4-nitro-benzoic acid-5-nitro-quinoline (1/1) and 5-chloro-2-nitro-benzoic acid-5-nitro-quinoline (1/1).

Project description:The structures of two isomeric com-pounds of 5-nitro-quinoline with chloro- and nitro-substituted benzoic acid, namely, 2-chloro-4-nitro-benzoic acid-5-nitro-quinoline (1/1), (I), and 5-chloro-2-nitro-benzoic acid-5-nitro-quinoline (1/1), (II), both C7H4ClNO4·C9H6N2O2, have been determined at 190?K. In each com-pound, the acid and base mol-ecules are held together by an O-H?N hydrogen bond. In the crystal of (I), the hydrogen-bonded acid-base units are linked by a C-H?O hydrogen bond, forming a tape structure along [10]. The tapes are stacked into a layer parallel to the ab plane via N-O?? inter-actions between the nitro group of the base mol-ecule and the quinoline ring system. The layers are further linked by other C-H?O hydrogen bonds, forming a three-dimensional network. In the crystal of (II), the hydrogen-bonded acid-base units are linked into a wide ribbon structure running along [10] via C-H?O hydrogen bonds. The ribbons are further linked via another C-H?O hydrogen bond, forming a layer parallel to (110). Weak ?-? inter-actions [centroid-centroid distances of 3.7080?(10) and 3.7543?(9)?Å] are observed between the quinoline ring systems of adjacent layers. Hirshfeld surfaces for the 5-nitro-quinoline mol-ecules of the two com-pounds mapped over shape index and d norm were generated to visualize the weak inter-molecular inter-actions.

| S-EPMC6829746 | biostudies-literature

3-Amino-benzoic acid-4-nitro-benzoic acid (1/1).

Project description:In the title 1:1 adduct, C(7)H(5)NO(4)·C(7)H(7)NO(2), the nitro group of the 4-nitro benzoic acid is twisted from the attached ring by 4.40?(8)°. In the crystal, the mol-ecules are linked into ribbon-like structures along [150] and [10] via O-H?O, N-H?O, N-H?N and C-H?O inter-molecular hydrogen bonds.

| S-EPMC2960102 | biostudies-literature

2-Amino-3-nitro-benzoic acid.

Project description:The title compound, C(7)H(6)N(2)O(4), is approximately planar (r.m.s. deviation = 0.026?Å for the 13 non-H atoms). The mol-ecular structure is stabilized by intra-molecular N-H?O hydrogen bonds, which generate S(6) ring motifs. In the crystal, mol-ecules are linked via inter-molecular N-H?O, O-H?O and C-H?O hydrogen bonds into a three-dimensional network.

| S-EPMC3275235 | biostudies-literature

2,4-Dichloro-6-nitro-benzoic acid.

Project description:The title compound, C(7)H(3)Cl(2)NO(4), was prepared by the reaction of 2,4-dichloro-6-nitro-toluene with 20% HNO(3) solution at 430?K. The carboxyl and nitro groups are twisted by 82.82?(12) and 11.9?(2)°, respectively, with respect to the benzene ring. The crystal structure is stabilized by O-H?O hydrogen bonding between carboxyl groups and weak C-H?O hydrogen bonding between the nitro group and the benzene ring of an adjacent mol-ecule.

| S-EPMC2960445 | biostudies-literature

2-(2-Nitro-anilino)benzoic acid.

Project description:In the title compound, C(13)H(10)N(2)O(4), the nitro N atom deviates by 0.031?(2)?Å from the plane of the benzene ring to which it is attached. The aromatic rings are oriented at a dihedral angle of 50.6?(1)°. An intra-molecular N-H?O hydrogen bond occurs. In the crystal, inversion dimers are formed by pairs of O-H?O inter-actions.

| S-EPMC3254547 | biostudies-literature

Crystal structure of 4-chloro-2-nitro-benzoic acid with 4-hy-droxy-quinoline: a disordered structure over two states of 4-chloro-2-nitro-benzoic acid-quinolin-4(1<i>H</i>)-one (1/1) and 4-hy-droxy-quinolinium 4-chloro-2-nitro-benzoate.

Project description:The title compound, C9H7.5NO·C7H3.5ClNO4, was analysed as a disordered structure over two states, viz. co-crystal and salt, accompanied by a keto-enol tautomerization in the base mol-ecule. The co-crystal is 4-chloro-2-nitro-benzoic acid-quinolin-4(1H)-one (1/1), C7H4ClNO4·C9H7NO, and the salt is 4-hy-droxy-quinolinium 4-chloro-2-nitro-benzoate, C9H8NO+·C7H3ClNO4 -. In the compound, the acid and base mol-ecules are held together by a short hydrogen bond [O⋯O = 2.4393 (15) Å], in which the H atom is disordered over two positions with equal occupancies. In the crystal, the hydrogen-bonded acid-base units are linked by N-H⋯O and C-H⋯O hydrogen bonds, forming a tape structure along the a-axis direction. The tapes are stacked into a layer parallel to the ab plane via π-π inter-actions [centroid-centroid distances = 3.5504 (8)-3.9010 (11) Å]. The layers are further linked by another C-H⋯O hydrogen bond, forming a three-dimensional network. Hirshfeld surfaces for the title compound mapped over shape-index and d norm were generated to visualize the inter-molecular inter-actions.

| S-EPMC6895935 | biostudies-literature

Crystal structure of a 1:1 cocrystal of nicotinamide with 2-chloro-5-nitro-benzoic acid.

Project description:In the title 1:1 cocrystal, C7H4ClNO4·C6H6N2O, nicotinamide (NIC) and 2-chloro-5-nitro-benzoic acid (CNBA) cocrystallize with one mol-ecule each of NIC and CNBA in the asymmetric unit. In this structure, CNBA and NIC form hydrogen bonds through O-H⋯N, N-H⋯O and C-H⋯O inter-actions along with N-H⋯O dimer hydrogen bonds of NIC. Further additional weak π-π inter-actions stabilize the mol-ecular assembly of this cocrystal.

| S-EPMC6829734 | biostudies-literature

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