scholarly journals Crystal structure of a new 2,6-bis(imino)pyridine derivative: (1E,1′E)-1,1′-(pyridine-2,6-diyl)bis[N-(4-chlorophenyl)ethan-1-imine]

2019 ◽  
Vol 75 (2) ◽  
pp. 115-118 ◽  
Author(s):  
Rajagopal Rajesh ◽  
E. S. Sella ◽  
Olivier Blacque ◽  
Kunjanpillai Rajesh
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Pyridine Ring ◽  
Pyridine Derivative ◽  
Asymmetric Unit ◽  
Double Bonds ◽  
Π Interactions ◽  
Compound C ◽  
Independent Molecules

The asymmetric unit of the title compound, C21H17Cl2N3, contains two crystallographically independent molecules (AandB). Both molecules haveEconfigurations for both imine double bonds with regard to the aryl and pyridine groups. The conformations of the two molecules differ with the 4-chlorophenyl rings being inclined to the central pyridine ring by 77.64 (6) and 86.18 (6)° in moleculeA, and 80.02 (5) and 43.41 (6)° in moleculeB. In the crystal, molecules are linked by a number of C—H...π interactions, forming layers parallel to thebcplane.

scholarly journals Crystal structure ofN-(quinolin-6-yl)hydroxylamine

2014 ◽  
Vol 70 (11) ◽  
pp. 322-324 ◽  
Author(s):  
Anuruddha Rajapakse ◽  
Roman Hillebrand ◽  
Sarah M. Lewis ◽  
Zachary D. Parsons ◽  
Charles L. Barnes ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Asymmetric Unit ◽  
Π Interactions ◽  
Compound C ◽  
Independent Molecules ◽  
A Minor

The title compound, C9H8N2O, crystallized with four independent molecules in the asymmetric unit. The four molecules are linkedviaone O—H...N and two N—H...N hydrogen bonds, forming a tetramer-like unit. In the crystal, molecules are further linked by O—H...N and N—H...O hydrogen bonds forming layers parallel to (001). These layers are linkedviaC—H...O hydrogen bonds and a number of weak C—H...π interactions, forming a three-dimensional structure. The crystal was refined as a non-merohedral twin with a minor twin component of 0.319.

scholarly journals Crystal structure of 1,4-diethoxy-9,10-anthraquinone

2015 ◽  
Vol 71 (7) ◽  
pp. o504-o505 ◽  
Author(s):  
Chitoshi Kitamura ◽  
Sining Li ◽  
Munenori Takehara ◽  
Yoshinori Inoue ◽  
Katsuhiko Ono ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Crystal Packing ◽  
Interplanar Distance ◽  
Dihedral Angles ◽  
Asymmetric Unit ◽  
Π Interactions ◽  
Compound C ◽  
Benzene Rings ◽  
Independent Molecules

The asymmetric unit of the title compound, C18H16O4, contains two crystallographically independent molecules. The anthraquinone ring systems are slightly bent with dihedral angles of 2.33 (8) and 13.31 (9)° between the two terminal benzene rings. In the crystal, the two independent molecules adopt slipped-parallel π-overlap with an average interplanar distance of 3.45 Å, forming a dimer; the centroid–centroid distances of the π–π interactions are 3.6659 (15)–3.8987 (15) Å. The molecules are also linked by C—H...O interactions, forming a tape structure along thea-axis direction. The crystal packing is characterized by a dimer-herringbone pattern.

scholarly journals Crystal structure of 1-methoxypyrene

2015 ◽  
Vol 71 (3) ◽  
pp. o210-o211 ◽  
Author(s):  
Eric G. Morales-Espinoza ◽  
Ernesto Rivera ◽  
Reyna Reyes-Martínez ◽  
Simón Hernández-Ortega ◽  
David Morales-Morales
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Asymmetric Unit ◽  
Π Interactions ◽  
Compound C ◽  
Independent Molecules

The title compound, C17H12O, crystallized with three independent molecules (A,BandC) in the asymmetric unit. In the crystal, the three independent molecules are linked by π–π interactions [centroid–centroid distances = 3.551 (3)–3.977 (2) Å], which lead to the formation of trimers. Between the trimers there are a number of C—H...π interactions generating a laminar arrangement parallel to (010). The methoxymethyl group in moleculeAis disordered over two sets of sites, with an occupancy ratio of 0.56 (9):0.44 (9).

scholarly journals Crystal structure of 2-methyl-4-[(thiophen-2-yl)methylidene]-1,3-oxazol-5(4H)-one

2015 ◽  
Vol 71 (2) ◽  
pp. o123-o124 ◽  
Author(s):  
Preetika Sharma ◽  
K. N. Subbulakshmi ◽  
B. Narayana ◽  
K. Byrappa ◽  
Rajni Kant
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Asymmetric Unit ◽  
Π Interactions ◽  
Compound C ◽  
Independent Molecules ◽  
The Individual

The asymmetric unit of the title compound, C9H7NO2S, contains two crystallographically independent molecules (AandB). Both molecules are almost planar [maximum deviations = 0.047 (1) and 0.090 (1) Å, respectively, for the S atoms] with the oxazole and thiophene rings being inclined to one another by 2.65 (16)° in moleculeAand by 4.55 (15)° in moleculeB. In the crystal, the individual molecules are linkedviaC—H...O hydrogen bonds, forming –A–B–A–B– chains along the [10-1] direction. The chains are linkedviaC—H...π and π–π interactions [intercentroid distances = 3.767 (2) and 3.867 (2) Å] involving inversion-related oxazole and thiophene rings in both molecules, forming a three-dimensional structure.

scholarly journals Ethyl (3-nitro-2-oxo-1,2-dihydropyridin-1-yl)acetate

2006 ◽  
Vol 62 (7) ◽  
pp. o2714-o2716 ◽  
Author(s):  
N. David Karis ◽  
Wendy A. Loughlin ◽  
Ian D. Jenkins ◽  
Peter C. Healy
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Van Der Waals ◽  
The Other ◽  
Van Der Waals Interactions ◽  
Asymmetric Unit ◽  
Π Interactions ◽  
Compound C ◽  
Independent Molecules

The title compound, C9H10N2O5, crystallizes with two crystallographically independent molecules in the asymmetric unit. In the crystal structure, the nitropyridone rings are connected by weak C—H...O interactions, forming sheet-like arrays, which are in turn linked by C—H...π and π–π interactions between the nitropyridone rings on one side, and by C—H...O and van der Waals interactions between the ester groups on the other.

scholarly journals Crystal structure of (E)-4-benzylidene-6-phenyl-1,2,3,4,7,8,9,10-octahydrophenanthridine

2017 ◽  
Vol 73 (7) ◽  
pp. 1092-1096
Author(s):  
Baidaa K. Al-Rubaye ◽  
Alice Brink ◽  
Gary J. Miller ◽  
Herman Potgieter ◽  
Mohamad J. Al-Jeboori
Keyword(s):  
Crystal Structure ◽  
Nitrogen Atom ◽  
Title Compound ◽  
Ammonium Acetate ◽  
Molar Ratio ◽  
Asymmetric Unit ◽  
Π Interactions ◽  
Envelope Conformation ◽  
Compound C ◽  
Independent Molecules

The preparation of the title compound, C26H25N, was achieved by the condensation of an ethanolic mixture of benzaldehyde, cyclohexanone and ammonium acetate in a 2:1:1 molar ratio. There are two crystallographically independent molecules in the asymmetric unit. The two cyclohexyl rings adopt ananti-envelope conformation with the benzyl moiety adopting acisconformation with respect to the nitrogen atom of the phenanthridine segment. In the crystal, molecules are linked through C—H...N interactions into hydrogen-bonded chains that are further arranged into distinct layers by weak offset π–π interactions.

scholarly journals Crystal structure of (E)-N1-[(anthracen-9-yl)methylidene]-N4-phenylbenzene-1,4-diamine

2017 ◽  
Vol 73 (2) ◽  
pp. 137-140
Author(s):  
Md. Serajul Haque Faizi ◽  
Ashanul Haque ◽  
Musheer Ahmad ◽  
Irina A. Golenya
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Condensation Reaction ◽  
Asymmetric Unit ◽  
Axis Direction ◽  
Π Interactions ◽  
Compound C ◽  
Independent Molecules

The title compound, C27H20N2, a Schiff base synthesizedviaa condensation reaction between anthracene-9-carbaldehyde andN-phenyl-p-phenylenediamine, crystallizes with three independent molecules in the asymmetric unit. The three molecules have slightly varying overall conformations, all havingtransconformations with respect to the C=N bond. In the crystal, the packing features N—H...N hydrogen bonds, which connect molecules into chains extending along thec-axis direction, interlinked by C—H...π interactions (minimum H...Cg= 2.65 Å) into sheets lying parallel to (001).

scholarly journals 2-[(4-Methoxy-2-nitrophenyl)iminomethyl]phenol

2012 ◽  
Vol 68 (8) ◽  
pp. o2445-o2446 ◽  
Author(s):  
Aliakbar Dehno Khalaji ◽  
Mahsa Nikookar ◽  
Karla Fejfarová ◽  
Michal Dušek
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Dihedral Angles ◽  
Asymmetric Unit ◽  
Aromatic Rings ◽  
Π Interactions ◽  
Compound C ◽  
Independent Molecules

The crystal structure of the title compound, C14H12N2O4, contains four crystallographically independent molecules in the asymmetric unit. All the molecules have similar conformations; the dihedral angles between the aromatic rings are 33.1 (1), 33.76 (9), 31.41 (9) and 32.56 (10)°. Intramolecular O—H...N hydrogen bonds formS(6) ring motifs in each molecule. In the crystal, there are two pairs of pseudo-inversion-related molecules. Along thecaxis, molecules are stacked with π–π interactions between the 2-hydroxyphenyl and 4-methoxy-2-nitrophenyl rings [centroid–centroid distances = 3.5441 (12)–3.7698 (12) Å].

2-Carbamoyl-3-pyridyl benzoate

2007 ◽  
Vol 63 (3) ◽  
pp. o1421-o1422
Author(s):  
Gilles Gasser ◽  
Helen Stoeckli-Evans
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Pyridine Ring ◽  
Carboxylate Group ◽  
Asymmetric Unit ◽  
Compound C ◽  
Phenyl Rings ◽  
Independent Molecules

The title compound, C13H10N2O3, crystallizes with two independent molecules (A and B) per asymmetric unit. In both molecules, there is an intramolecular N—H...N hydrogen bond and the two molecules are linked by C—H...π interactions. The main differences between the two molecules concern the orientation of the amide unit with respect to the pyridine ring, and the orientation of the carboxylate group with respect to both the pyridine and phenyl rings. In the crystal structure, symmetry-related molecules are linked by N—H...N, N—H...O and C—H...O hydrogen bonds, forming a slab-like structure, two molecules thick, which are stacked in the c-axis direction.

scholarly journals 8-Methoxy-3-methyl-3,4-dihydro-2H-1,3-benzoxazine

2013 ◽  
Vol 69 (11) ◽  
pp. o1619-o1619
Author(s):  
Jing Zhu ◽  
Xiang-Xiang Yang ◽  
Long-Yu Xu ◽  
Zhi-Dong Ren ◽  
Ling-Bo Qu
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Chair Conformation ◽  
Asymmetric Unit ◽  
Π Interactions ◽  
Compound C ◽  
Independent Molecules

The title compound, C10H13NO2, crystallizes with two crystallographically independent molecules of similar geometry in the asymmetric unit; the six-membered oxazine rings adopts a half-chair conformation. Neither hydrogen bonds nor π–π interactions are observed in the crystal structure.

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