Author
Cong-Ming Li
Bio: Cong-Ming Li is an academic researcher from Shenyang University. The author has contributed to research in topics: Dihedral angle & Hydrogen bond. The author has an hindex of 5, co-authored 7 publications receiving 56 citations.
Topics: Dihedral angle, Hydrogen bond, Schiff base
Papers
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TL;DR: In the title compound, C16H16N2O3, the benzohydrazide group is not planar and the molecule exists in a trans configuration with respect to the methylidene unit, where the dihedral angle between the two substituted benzene rings is 26.9 (2)°.
Abstract: In the title compound, C16H16N2O3, the benzohydrazide group is not planar and the molecule exists in a trans configuration with respect to the methylidene unit The dihedral angle between the two substituted benzene rings is 269 (2)° In the crystal structure, the molecular packing is stabilized by intramolecular O—H⋯N and intermolecular N—H⋯O hydrogen bonds The intermolecular hydrogen bonding forms chains parallel to the b axis
16 citations
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TL;DR: The benzohydrazide group is not planar and the molecule exists in a trans configuration with respect to the methylidene unit in the title compound, C16H15BrN2O3, to form chains parallel to the c cell axis.
Abstract: In the title compound, C16H15BrN2O3, the benzohydrazide group is not planar and the molecule exists in a trans configuration with respect to the methylidene unit. The dihedral angle between the two substituted benzene rings is 75.6 (2)°. In the crystal structure, molecules are linked by intermolecular N—H⋯O hydrogen bonds involving carbonyl and amine functionalities, to form chains parallel to the c cell axis.
13 citations
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TL;DR: In the title compound, C15H12ClN3O4, the benzohydrazide group is not planar and the molecule exists in a trans configuration with respect to the methylidene unit.
Abstract: In the title compound, C15H12ClN3O4, the benzohydrazide group is not planar and the molecule exists in a trans configuration with respect to the methylidene unit. The dihedral angle between the two substituted benzene rings is 0.4 (3)°. In the crystal structure, molecules are linked by intermolecular N—H⋯O hydrogen bonds, forming chains parallel to the c axis.
12 citations
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TL;DR: The C14H11N3O4 compound as discussed by the authors has a planar structure with a dihedral angle between the planes of the two substituted benzene rings being 2.54°(7)°.
Abstract: The molecule of the title compound, C14H11N3O4, is approximately planar, the dihedral angle between the planes of the two substituted benzene rings being 2.54 (7)°. The molecule exists in a trans configuration with respect to the central methylidene unit. In the crystal structure, molecules are linked through intermolecular O—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds, forming layers parallel to (101). The O/N—H⋯O and C—H⋯O interactions form a pair of bifurcated acceptor bonds involving the cabonyl/nitro O atom, generating an R21(6) motif.
8 citations
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TL;DR: In this paper, the authors describe a C16H15BrN2O3 compound with two independent mol-ecules (A and B) in the asymmetric unit and two intermolecular N-H⋯O hydrogen bonds, forming chains parallel to the c axis.
Abstract: In the title compound, C16H15BrN2O3, there are two independent molecules (A and B) in the asymmetric unit. The major difference between the two molecules is the dihedral angle formed by the aromatic rings [72.6 (2) and 18.8 (2)° for A and B, respectively]. The benzohydrazide groups are not planar and the molecules exist in trans configurations with respect to the methylidene units. The molecular packing is stabilized by two intermolecular N—H⋯O hydrogen bonds, forming chains parallel to the c axis. Only the A molecules of the asymmetric unit are held together by π–π interactions [centroid–centroid distance = 3.714 (3) A].
6 citations
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TL;DR: The benzohydrazide derivative C15H14N2O4 as discussed by the authors, which is a benzene derivative, exists in a trans conformation with respect to the C=N double bond and is twisted, the dihedral angle between the two benzene rings being 24.17°.
Abstract: The molecule of the title benzohydrazide derivative, C15H14N2O4, exists in a trans conformation with respect to the C=N double bond and is twisted, the dihedral angle between the two benzene rings being 24.17 (6)°. The methoxy group is almost co-planar with respect to the attached benzene ring [Cm—O—C—C (m = methyl) = −1.45 (17)°]. In the crystal, the molecules are linked by N—H⋯O and O—H⋯O hydrogen bonds into sheets parallel to the bc plane. These sheets are further connected into a three-dimensional network by weak C—H⋯O and C—H⋯π interactions.
18 citations
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TL;DR: In the title compound, C16H16N2O3, the benzohydrazide group is not planar and the molecule exists in a trans configuration with respect to the methylidene unit, where the dihedral angle between the two substituted benzene rings is 26.9 (2)°.
Abstract: In the title compound, C16H16N2O3, the benzohydrazide group is not planar and the molecule exists in a trans configuration with respect to the methylidene unit The dihedral angle between the two substituted benzene rings is 269 (2)° In the crystal structure, the molecular packing is stabilized by intramolecular O—H⋯N and intermolecular N—H⋯O hydrogen bonds The intermolecular hydrogen bonding forms chains parallel to the b axis
16 citations
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TL;DR: In the asymmetric unit of the title compound, C18H20N2O5, there are two crystallographic independent molecules, both molecules are twisted; the dihedral angle between the two benzene rings is 7.2 (5)° in one molecule, whereas it is 85.9”(4)°in the other.
Abstract: The title benzohydrazide derivative, C17H18N2O5, exists in a trans conformation with respect to the C=N double bond. The dihedral angle between the benzene rings is 19.41 (5)°. The two methoxy groups at the meta positions of the trimethoxybenzene group are almost coplanar with the ring [C—O—C—C = 1.62 (16) and 178.33 (10)°], whereas the third methoxy group, at the para position, is (+)-synclinal with the ring. In the crystal, molecules are linked by N—H⋯O and bifurcated O—H⋯(N,O) hydrogen bonds, as well as weak C—H⋯O interactions, into sheets lying parallel to the ac plane. A C—H⋯π interaction also occurs.
16 citations
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TL;DR: In this article, a new phenol and hydrazide derivatives were obtained for the first time from the C. giganteawhite by silica gel column chromatography.
Abstract: − A new phenol and hydrazide derivatives were obtained for the first time from the C. giganteawhite by silica gel column chromatography. The structure of the isolated compounds was identified by UV, IR NMR and MS. C. gigantea was scientifically reported for several medicinal properties viz. analgesic, antimicrobial and cytotoxic. In this screening work, anti-microbial activity of test compounds was found to be active against all organisms. Additionally, anti-inflammatory activity of the test groups has reduced the thickness of edema of the hind paw compared to the control group. Keywords−Calotropis gigantea white, anti-microbial activity, Anti-inflammatory activity, 4-methoxy-3-(methoxymethyl) phenol, (E)-N'-(5-bromo-2-methoxybenzylidene)-4-methoxy benzohydrazide
10 citations
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TL;DR: The hydrazone molecule of the title compound, C15H13N3O4·CH4O, is nearly planar, with a dihedral angle between the two benzene rings of 1.2 (4)°.
Abstract: The hydrazone molecule of the title compound, C15H13N3O4·CH4O, is nearly planar, with a dihedral angle between the two benzene rings of 1.2 (4)°. The molecule exists in a trans configuration with respect to the central methylidene unit. In the crystal, the benzohydrazide and methanol molecules are linked through intermolecular O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds, forming chains along the a axis.
10 citations