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(E)-N'-(3-Nitro-benzyl-idene)-4-(8-quinol-yloxy)butano-hydrazide.

ABSTRACT: In the title Schiff base compound, C(20)H(18)N(4)O(4), the conformation along the bond sequence linking the benzene and quinoline rings is trans-(+)gauche-trans-trans-(+)gauche-trans-trans. The dihedral angle between the aromatic ring systems is 80.3?(6)°. In the crystal, a pair of inter-molecular N-H?N hydrogen bonds link the mol-ecules into centrosymmetric R(2) (2)(20) dimers, which are aggregated via ?-? inter-actions into sheets [quinoline-benzene ring centroid-centroid separation = 3.572?(2)-3.773?(3)?Å].

SUBMITTER: Zeng L

PROVIDER: S-EPMC3007025 | biostudies-literature | 2010 Jun

REPOSITORIES: biostudies-literature

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(E)-N'-(3-Nitro-benzyl-idene)-4-(8-quinol-yloxy)butano-hydrazide.

Zeng Li L Zhou Xiao-Si XS Lv Li-Hua LH Li Geng-Xi GX

Acta crystallographica. Section E, Structure reports online 20100616 Pt 7

In the title Schiff base compound, C(20)H(18)N(4)O(4), the conformation along the bond sequence linking the benzene and quinoline rings is trans-(+)gauche-trans-trans-(+)gauche-trans-trans. The dihedral angle between the aromatic ring systems is 80.3 (6)°. In the crystal, a pair of inter-molecular N-H⋯N hydrogen bonds link the mol-ecules into centrosymmetric R(2) (2)(20) dimers, which are aggregated via π-π inter-actions into sheets [quinoline-benzene ring centroid-centroid separation = 3.572 (2 ...[more]

PMID: 21587886

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(E)-N'-(4-Nitro-benzyl-idene)-4-(8-quinol-yloxy)butano-hydrazide.

Project description:In the title compound, C(20)H(18)N(4)O(4), conformation along the bond sequence linking the benzene and quinoline rings, which have a mean inter-planar dihedral angle of 2.7?(5)°, is trans-(+)gauche-trans-trans-(-)gauche-trans-trans. In the crystal structure, a pair of inter-molecular N-H?O hydrogen bonds links the mol-ecules into centrosymmetric cyclic R(2) (2)(8) dimers, which are aggregated via ?-? inter-actions into parallel sheets [quinoline-benzene ring centroid separation = 3.6173?(16)-3.6511?(16)?Å]. The sheets are further connected through weak C-H?O inter-actions, giving a supra-molecular two-dimensional network.

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(E)-N'-(4-Nitro-benzyl-idene)-2-(8-quinol-yloxy)acetohydrazide methanol solvate.

Project description:In the title compound, C(18)H(14)N(4)O(4)·CH(3)OH, the mean planes of the benzene ring and the quinoline ring system make a dihedral angle of 15.5?(2)°. The methanol solvent mol-ecule forms an O-H?N hydrogen bond to the quinoline ring system and accepts an N-H?O hydrogen bond from the hydrazide NH group. The mol-ecules lie in layers approximately parallel to (101) and C-H?O inter-actions exist between mol-ecules within the layers.

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N'-(2-Methoxy-benzyl-idene)-2-nitro-benzo-hydrazide.

Project description:The title compound, C(15)H(13)N(3)O(4), was synthesized by the reaction of equimolar quanti-ties of 2-methoxy-benzaldehyde and 2-nitro-benzohydrazide in methanol. The dihedral angle between the two substituted benzene rings is 68.3?(2)°. In the crystal structure, inversion dimers linked by pairs of N-H?O hydrogen bonds occur.

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2-Chloro-N'-(4-nitro-benzyl-idene)benzo-hydrazide.

Project description:The title Schiff base compound, C(14)H(10)ClN(3)O(3), exists in a trans configuration with respect to the C=N bond. The dihedral angle between the two benzene rings is 15.9?(2)°. In the crystal, the mol-ecules are linked into chains along [101] by inter-molecular N-H?O hydrogen bonds.

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(E)-2-Fluoro-N'-(4-nitro-benzyl-idene)benzo-hydrazide.

Project description:In the title hydrazone compound, C(14)H(10)FN(3)O(3), the dihedral angle between the two substituted benzene rings is 13.7?(3)°. The mol-ecule exists in a trans configuration with respect to the central methyl-idene unit. In the crystal, mol-ecules are linked through inter-molecular N-H?O hydrogen bonds, forming chains along the a axis.

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(E)-N'-(3,4,5-Trimethoxy-benzyl-idene)-2-(8-quinol-yloxy)acetohydrazide methanol solvate.

Project description:In the title compound, C(21)H(21)N(3)O(5)·CH(4)O, the quinoline plane and the benzene ring form a dihedral angle of 3.6?(2)°. The methanol solvent mol-ecule is linked with the acetohydrazide mol-ecule via O-H?N and N-H?O hydrogen bonds. In the crystal structure, weak inter-molecular C-H?O hydrogen bonds help to consolidate the crystal packing, which also exhibits ?-? inter-actions, as indicated by short distances of 3.739?(4)?Å between the centroids of the aromatic rings.

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(E)-N'-(5-Chloro-2-hydroxy-benzyl-idene)-4-(8-quinol-yloxy)butanohydrazide monohydrate.

Project description:The crystal of the title Schiff base compound, C(20)H(18)ClN(3)O(3)·H(2)O, was twinned by a twofold rotation about (100). The asymmetric unit contains two crystallographically independent mol-ecules with similar conformations, and two water mol-ecules. The C=N-N angles of 115.7?(6) and 116.2?(6)° are significantly smaller than the ideal value of 120° expected for sp(2)-hybridized N atoms and the dihedral angles between the benzene ring and quinoline ring system in the two mol-ecules are 52.5?(7) and 53.9?(7)°. The mol-ecules aggregate via C-Cl?? and ?-? inter-actions [centroid-centroid distances = 3.696?(5)-3.892?(5)?Å] and weak C-H?O inter-actions as parallel sheets, which are further linked by water mol-ecules through N-H?O and O-H?O hydrogen bonds into a supra-molecular two-dimensional network.

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(E)-N'-(3,4-Dimethoxy-benzyl-idene)-2-(8-quinol-yloxy)acetohydrazide-methanol-water (1/1/1).

Project description:In the title compound, C(20)H(19)N(3)O(4)·CH(4)O·H(2)O, the Schiff base mol-ecule is almost planar, with a dihedral angle of 1.2?(1)° between the benzene ring and the quinoline ring system. An intra-molecular N-H?O hydrogen bond generates an S(6) ring. In the crystal, the methanol and water solvent mol-ecules are linked to the Schiff base mol-ecule via N-H?O, O-H?O, O-H?N and O-H?(O,N) hydrogen bonds.

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N'-[(E)-4-Benz-yloxy-2-hy-droxy-benzyl-idene]-4-nitro-benzohydrazide monohydrate.

Project description:The title compound, C(21)H(17)N(3)O(5)·H(2)O, exists in the keto form with an E conformation with respect to the azomethine double bond. The twist angles between the aromatic rings are in the range 4.67?(10)-17.54?(10)°. A water mol-ecule of solvation is present in the lattice. A conventional intra-molecular O-H?N hydrogen bond increases the rigidity of the mol-ecule. Inter-molecular O-H?O, N-H?O and C-H?O hydrogen-bonding inter-actions establish a supra-molecular linkage among the mol-ecules in the crystal structure. There are also C-H?? inter-actions present.

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(E)-N'-(2,5-Dimethoxy-benzyl-idene)-2-(8-quinol-yloxy)acetohydrazide methanol solvate.

Project description:The two mol-ecules in the asymmetric unit of the title compound, C(20)H(19)N(3)O(4)·CH(4)O, are paired via O-H?(O,N), N-H?O, and C-H?O hydrogen bonds. The mol-ecular skeleton of the acetohydrazide mol-ecule is close to planar; the benzene and quinoline mean planes form a dihedral angle of 3.9?(3)°. The crystal packing exhibits weak inter-molecular C-H?O hydrogen bonds and ?-? inter-actions, indicated by short distances of 3.668?(3)?Å, between the centroids of N-containing six-membered rings from neighbouring acetohydrazide mol-ecules.

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