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1.  (Z)-N-[2-(N′-Hy­droxy­carbamimido­yl)phen­yl]acetamide 
The asymmetric unit of the title compound, C9H11N3O2, contains two mol­ecules (A and B), which exist in Z conformations with respect to their C=N double bond. The dihedral angles between the benzene ring and the pendant hy­droxy­carbamimidoyl and acetamide groups are 28.58 (7) and 1.30 (5)°, respectively, in mol­ecule A and 25.04 (7) and 27.85 (9)°, respectively, in mol­ecule B. An intra­molecular N—H⋯N hydrogen bond generates an S(6) ring in both mol­ecules. Mol­ecule A also features an intra­molecular C—H⋯O inter­action, which closes an S(6) ring. In the crystal, the mol­ecules are linked by N—H⋯O, N—H⋯N, O—H⋯O, O—H⋯N, C—H⋯O and C—H⋯N hydrogen bonds and C—H⋯π inter­actions, generating a three-dimensional network.
PMCID: PMC3588555  PMID: 23476559
2.  2-(4-Meth­oxy­phenyl)-2-oxoethan­aminium chloride 
In the cation of the title compound, C9H12NO2 +·Cl−, the dihedral angle between the 2-oxoethanaminium N—C—C(=O)– plane [maximum deviation = 0.0148 (12) Å] and the benzene ring is 7.98 (8)°. The meth­oxy group is approximately in-plane with the benzene ring, with a C—O—C—C torsion angle of −2.91 (18)°. In the crystal, the cations and chloride anions are connected by N—H⋯Cl and C—H⋯Cl hydrogen bonds, forming a layer parallel to the bc plane. A C—H⋯π inter­action further links the layers.
PMCID: PMC3470349  PMID: 23125762
3.  2-Azido-1-(3,6-dichloro-9H-fluoren-1-yl)ethanone 
In the title compound, C15H9Cl2N3O, an intra­molecular C—H⋯O inter­action generates an S(7) ring motif. The cyclo­penta-1,3-diene ring forms dihedral angles of 1.93 (6) and 2.78 (6)° with its attached benzene rings. In the crystal, mol­ecules are linked by C—H⋯N and C—H⋯O hydrogen bonds, thereby forming layers lying parallel to the ac plane. The crystal also features a π–π inter­action with a centroid–centroid distance of 3.5612 (6) Å.
PMCID: PMC3201472  PMID: 22058777
4.  Bis(4-fluoro­anilinium) sulfate 
In the crystal of the title molecular salt, 2C6H7FN+·SO4 2−, the cations and anions are linked by N—H⋯O and C—H⋯O hydrogen bonds into sheets parallel to the ab plane. The crystal studied was found to be a racemic twin with a 0.50 (10):0.50 (10) domain ratio.
PMCID: PMC3200818  PMID: 22058998
5.  (E)-4-Phenyl­butan-2-one oxime 
In the title compound, C10H13NO, the C—C—C—C torsion angle formed between the benzene ring and the butan-2-one oxime unit is 73.7 (2)°, with the latter lying above the plane through the benzene ring. In the crystal, inter­molecular O—H⋯N hydrogen bonds link pairs of mol­ecules into dimers, forming R 2 2(6) ring motifs which are stacked along the a axis.
PMCID: PMC3200599  PMID: 22065139
6.  1-Isobutyl-4-meth­oxy-1H-imidazo[4,5-c]quinoline 
In the title compound, C15H17N3O, the 1H-imidazo[4,5-c]quinoline ring system is approximately planar, with a maximum deviation of 0.036 (1) Å. The C—N—C—C torsion angles formed between this ring system and the isobutyl unit are −99.77 (16) and 79.71 (17)°. In the crystal, inter­molecular C—H⋯O hydrogen bonds link the mol­ecules into chains along the c axis.
PMCID: PMC3200859  PMID: 22058955

Results 1-6 (6)