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2-[(2-Hy-droxy-4-meth-oxy-benzyl-idene)aza-nium-yl]benzoate monohydrate.

ABSTRACT: In the title compound, C(15)H(13)NO(4)·H(2)O, the Schiff base exists in a zwitterionic form and a bifurcated intra-molecular N-H⋯(O,O) hydrogen bond generates two S(6) rings. The dihedral angle between the two benzene rings is 25.8 (2)°. The crystal structure is stabilized by inter-molecular O-H⋯O hydrogen bonds.

SUBMITTER: Hang ZX

PROVIDER: S-EPMC3006953 | biostudies-literature | 2010 Jun

REPOSITORIES: biostudies-literature

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2-[(2-Hy-droxy-4-meth-oxy-benzyl-idene)aza-nium-yl]benzoate monohydrate.

Hang Zhi-Xi ZX Dong Bo B Wang Xing-Wen XW

Acta crystallographica. Section E, Structure reports online 20100626 Pt 7

In the title compound, C(15)H(13)NO(4)·H(2)O, the Schiff base exists in a zwitterionic form and a bifurcated intra-molecular N-H⋯(O,O) hydrogen bond generates two S(6) rings. The dihedral angle between the two benzene rings is 25.8 (2)°. The crystal structure is stabilized by inter-molecular O-H⋯O hydrogen bonds. ...[more]

PMID: 21587989

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2-Hy-droxy-5-{[(E)-4-meth-oxy-benzyl-idene]aza-nium-yl}benzoate.

Project description:In the title zwitterion, C(15)H(13)NO(4), obtained from the condensation of 5-amino-salicylic acid and 4-meth-oxy-benz-alde-hyde, the 4-hydoxyanilinic group of the 5-amino-salicylic acid moiety and the 4-meth-oxy-benzaldehyde moiety are twisted with respect to one another, making a dihedral angle of 10.37 (7)°. The carboxyl-ate group makes a dihedral angle of 5.7 (2)° with the parent 4-hydoxyanilinic group. An intra-molecular O-H⋯O hydrogen bond forms an S(6) ring motif. In the crystal, inter-molecular C-H⋯O and N-H⋯O hydrogen bonds with R(2) (1)(7) ring motifs link the mol-ecules into infinite chains extending along the c axis. The occurence of slipped π-π stacking between symmetry-related aromatic rings reinforces the packing.

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Crystal structure of (E)-2-[(4-hy-droxy-benzyl-idene)aza-nium-yl]benzoate.

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(E)-N'-(5-Bromo-2-hy-droxy-3-meth-oxy-benzyl-idene)-2-hy-droxy-benzohydrazide monohydrate.

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N'-[(E)-5-Bromo-2-hy-droxy-3-meth-oxy-benzyl-idene]-4-meth-oxy-benzohydrazide monohydrate.

Project description:In the title compound, C(16)H(15)BrN(2)O(4)·H(2)O, the hydrazide mol-ecule is nearly planar, with a largest deviation from the mean plane through the non-H atoms of 0.106 (4) Å and a dihedral angle between the benzene rings of 1.98 (16)°. This mol-ecule adopts an E conformation about the C=N bond and an intra-molecular O-H⋯N hydrogen bond increases the rigidity. In the crystal, some mol-ecules of the title hydrazide are replaced by mol-ecules of its 6-bromo isomer, and the Br atom from this admixture mol-ecule was refined to give a partial occupancy of 0.0523 (13). The hydrazide and water mol-ecules are linked through classical N-H⋯O and O-H⋯O hydrogen bonds, forming layers parallel to (110). C-H⋯π inter-actions are also present.

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N'-[(E)-2-Hy-droxy-5-meth-oxy-benzyl-idene]-2-meth-oxy-benzohydrazide.

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N'-[(E)-5-Bromo-2-hy-droxy-3-meth-oxy-benzyl-idene]benzohydrazide monohydrate.

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N'-[(E)-2-Hy-droxy-5-meth-oxy-benzyl-idene]pyridine-4-carbohydrazide monohydrate.

Project description:The title compound, C14H13N3O3·H2O, adopts an E conformation with respect to the azomethine bond and crystallizes in the amide form. An intra-molecular O-H⋯N hydrogen bond occurs. In the crystal, the lattice water molecule plays a major role in the supramolecular architecture by interconnecting adjacent molecules into a three-dimensional netwrok by means of O-H⋯O, O-H⋯N and N-H⋯O hydrogen-bonding inter-actions. The structure also features two non-classical C-H⋯O inter-actions.

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(E)-4-Bromo-N'-(4-hy-droxy-3-meth-oxy-benzyl-idene)benzohydrazide monohydrate.

Project description:In the title compound, C(15)H(13)BrN(2)O(3)·H(2)O, the dihedral angle between the two benzene rings is 13.92 (6)°. The meth-oxy group of the 4-hy-droxy-3-meth-oxy-phenyl is almost coplanar with its bound benzene ring, as seen by the C(meth-yl)-O-C-C torsion angle of -0.35 (16)°. In the crystal, mol-ecules are linked into a three-dimensional network by N-H⋯O, O-H⋯N and O-H⋯O hydrogen bonds and also weak C-H⋯O inter-actions. A short C⋯O contact of 3.0191 (15) Å is also present.

| S-EPMC3344027 | biostudies-literature

(E)-4-Amino-N'-(2-hy-droxy-5-meth-oxy-benzyl-idene)benzohydrazide monohydrate.

Project description:In the title compound, C(15)H(15)N(3)O(3)·H(2)O, the hydazide Schiff base mol-ecule shows an E conformation around the C=N bond. An intra-molecular O-H⋯N hydrogen bond makes an S(6) ring motif. The dihedral angle between the substituted phenyl rings is 23.40 (11)°. The water mol-ecule mediates linking of neighbouring mol-ecules through O-H⋯(O,O) hydrogen bonds into infinite chains along the a axis, which are further connected together through N-H⋯O hydrogen bonds, forming a two-dimensional network parallel to (001). C-H⋯O inter-actions aso occur.

| S-EPMC3414187 | biostudies-literature

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