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2,4-Dinitro-benzaldehyde hydrazone.

ABSTRACT: The title compound, C(7)H(6)N(4)O(4), plays an important role in the synthesis of biologically active compounds. The planar hydrazone group is oriented at a dihedral angle of 8.27 (3)° with respect to the benzene ring. In the crystal structure, inter-molecular N-H⋯O and N-H⋯N hydrogen bonds link the mol-ecules.

SUBMITTER: Zhang N

PROVIDER: S-EPMC2960920 | biostudies-literature |

REPOSITORIES: biostudies-literature

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2,4-Dichloro-benzaldehyde 2,4-dinitro-phenyl-hydrazone.

Project description:The asymmetric unit of the title compound, C(13)H(8)Cl(2)N(4)O(4), contains two independent but similar and almost planar mol-ecules. An intra-molecular N-H⋯O hydrogen bond is observed in each mol-ecule.

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Project description:In the title compound, C(14)H(12)N(4)O(5), an intra-molecular N-H?O hydrogen bond generates an S(6) ring motif. The dihedral angle between the two benzene rings is 3.91?(3)°, which shows the mol-ecule is almost planar. The para-nitro group is twisted from the benzene ring to which it is attached, making a dihedral angle of 8.50?(9)°. In the crystal structure, mol-ecules are linked together by inter-molecular C-H?O and inter-molecular three-centred O?O [2.8646?(12)-2.9213?(11)?Å] and O?N [3.0518?(11)?Å] inter-actions. The crystal structure is further stabilized by inter-molecular ?-? inter-actions [centroid-to-centroid distances 3.5708?(6)-3.9728?(12)?Å].

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Project description:In the title compound, C(10)H(10)N(4)O(4), the but-2-enal chain is almost planar, the largest deviation from the mean plane being 0.013 (1) Å, and this plane makes a dihedral angle of 9.95 (24)° with the benzene ring,. Of the two nitro groups, one is twisted with respect to the benzene ring, making a dihedral angle of 5.7 (1)°, whereas the other is nearly in the plane of the benzene ring, with a twist angle of only 0.7 (1)°. This difference is related to the occurence of an intra-molecular N-H⋯O hydrogen bond with the O atom of the less twisted nitro group. The NH group is also involved in a weak inter-action with the same O atom of a symmetry-related mol-ecule, thus forming a pseudo inversion dimer.

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Project description:Crystals of the title compound, C(11)H(14)N(4)O(4), were obtained from a condensation reaction of 2,4-dinitro-phenyl-hydrazine and 3-penta-none. In the crystal structure, the mol-ecule, except one methyl group, displays a nearly planar structure. The imino group links to the adjacent nitro group via intra-molecular hydrogen bonding. The partially overlapped arrangement and face-to-face separation of 3.410 (9) Å between parallel benzene rings indicate the existence of π-π stacking between adjacent mol-ecules. The crystal structure also contains weak inter-molecular C-H⋯O hydrogen bonding.

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Project description:Crystals of the title compound, C(12)H(10)N(4)O(5), were obtained from a condensation reaction of 2,4-dinitro-phenyl-hydrazine and 2-furyl methyl ketone. The mol-ecule displays a nearly planar structure, and the furan ring is slightly twisted by a dihedral angle of 12.62 (6)° with respect to the phenyl-hydrazone plane. The face-to-face separation of 3.287 (7) Å between parallel benzene rings of adjacent mol-ecules indicates the existence of π-π stacking between dinitro-phenyl rings in the crystal structure.

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Project description:In the title compound, C(21)H(18)N(4)O(4), there is an intra-molecular N-H?O hydrogen bond between the amino H atom and an O atom of the 2-nitro group of the adjacent benzene ring. The central benzene ring forms dihedral angles of 79.98?(7) and 82.88?(7)° with the two phenyl rings. In the crystal structure, mol-ecules are linked into a three-dimensional network by weak C-H?N, C-H?O and C-H?? inter-actions.

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Project description:In the title compound, C(16)H(16)N(4)O(4), the dihedral angle between the aromatic rings is 79.04?(8)° and an intra-molecular N-H?O hydrogen bond occurs. In the crystal, weak C-H.·O and C-H..? inter-actions link the mol-ecules, forming sheets.

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