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1.  (E)-N′-(3,4-Di­meth­oxy­benzyl­idene)nicotinohydrazide monohydrate 
In the title hydrated compound, C15H15N3O3·H2O, the nicotinohydrazide mol­ecule adopts a trans conformation with respect to the C=N double bond. The dihedral angle between the benzene and pyridine rings is 5.10 (14)°. In the crystal, the solvent water mol­ecule acts as an acceptor, forming an N—H⋯O hydrogen bond supported by two C—H⋯O contacts. It also acts as a donor, forming bifurcated O—H⋯(O,O) and O—H⋯N hydrogen bonds that combine with the former contacts to form zigzag chains of mol­ecules along the c-axis direction. An additional O—H⋯O donor contact completes a set of six hydrogen bonds to and from the water mol­ecule and connects it to a third nicotinohydrazide mol­ecule. This latter contact combines with weaker C—H⋯O hydrogen bonds supported by a C—H⋯π contact to stack mol­ecules along b in a three-dimensional network.
doi:10.1107/S1600536814013798
PMCID: PMC4120580  PMID: 25161576
2.  (E)-N′-(4-Meth­oxy­benzyl­idene)pyridine-3-carbohydrazide dihydrate 
In the title compound, C14H13N3O2·2H2O, the hydrazone mol­ecule adopts an E conformation with respect to the C=N bond. The dihedral angle between the benzene and pyridine rings is 8.55 (10)°. The methyl­idene–hydrazide [–C(=O)–N–N=C–] fragment is essentially planar, with a maximum deviation of 0.0375 (13) Å. The mean planes of the benzene and pyridine rings make dihedral angles of 2.71 (14) and 11.25 (13)°, respectively, with mean plane of the methyl­idene-hydrazide fragment. In the crystal, the benzohydrazide and water mol­ecules are linked by N—H⋯O, O—H⋯O and O—H⋯N hydrogen bonds into a three-dimensional network.
doi:10.1107/S1600536813017406
PMCID: PMC3770434  PMID: 24046719
3.  N-(4,4′-Dibromo-[1,1′-biphen­yl]-2-yl)benzamide 
In the title compound, C19H13Br2NO, the dihedral angle between the rings of the biphenyl group is 53.59 (14)°. The ring of the benzamide group is inclined to the phenyl rings of the biphenyl group by 23.87 (15) and 75.89 (15)°. There are no significant inter­molecular inter­actions in the crystal structure.
doi:10.1107/S1600536813000597
PMCID: PMC3569757  PMID: 23424503
4.  7-[(Morpholin-4-yl)(phen­yl)meth­yl]quinolin-8-ol 
In the title compound, C20H20N2O2, the quinoline ring system makes dihedral angles of 81.05 (4) and 61.16 (5)° with the mean planes of the benzene and morpholine rings, respectively; the mean planes of the latter two rings make a dihedral angle of 83.59 (4)°. In the crystal, pairs of O—H⋯N hydrogen bonds link neighbouring mol­ecules related by a twofold rotation axis, generating R 2 2(10) motifs.
doi:10.1107/S1600536812049343
PMCID: PMC3588227  PMID: 23476429
5.  12-(4-Meth­oxy­benzo­yl)-2-methyl­benzo[f]pyrido[1,2-a]indole-6,11-dione 
In the title compound, C25H17NO4, the indolizine fused naphthaquinone unit is approximately planar [r.m.s deviation = 0.0678 Å] and makes a dihedral angle of 57.82 (5)° with the benzene ring of the meth­oxy­benzene group. The naphtho­quinone O atoms deviate, in the same sense, from the mean plane of the fused six-membered rings by 0.2001 (14) and 0.0516 (14) Å. In the crystal there is π–π stacking of inversion-related pairs of mol­ecules [inter­planar spacing = 3.514 (2) Å].
doi:10.1107/S1600536812040408
PMCID: PMC3470392  PMID: 23125805
6.  2,2′-Bithio­phene-3,3′-dicarbonitrile 
The complete mol­ecule of the title compound, C10H4N2S2, is generated by an inversion center situated at the mid-point of the bridging C—C bond. The bithio­phene ring system is planar [maximum deviation = 0.003 (2) Å] and the central C—C bond length is 1.450 (2) Å. There are no significant inter­molecular inter­actions in the crystal structure, which is stabilized by van der Waals inter­actions.
doi:10.1107/S1600536812032503
PMCID: PMC3414987  PMID: 22904974
7.  2,3,6,7-Tetra­bromo-9-butyl-9H-carbazole 
In he title compound, C16H13Br4N, the carbazole skeleton is nearly planar [maximum deviation = 0.026 (4) Å] and makes a dihedral angle of 73.8 (4)° with the butyl chain. The butyl chain adopts a trans conformation. In the crystal, mol­ecules are linked by π–π stacking inter­actions [centroid–centroid distance = 3.559 (2) Å].
doi:10.1107/S1600536812013761
PMCID: PMC3344475  PMID: 22590237
8.  4,4′-Dibromo-2-nitro­biphen­yl 
The title compound, C12H7Br2NO2, a biphenyl derivative, displays a twisted conformation with the two benzene rings making a dihedral angle of 55.34 (14)°. The dihedral angle between the nitro group and its parent benzene ring is 26.8 (2)°. The crystal structure is stabilized by inter­molecular C—H⋯Br and C—H⋯O inter­actions, which lead to the formation of chains propagating along the c-axis direction.
doi:10.1107/S1600536812000347
PMCID: PMC3275008  PMID: 22346953

Results 1-8 (8)