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1.  8-{(E)-[(4-Chloro­phen­yl)imino]­meth­yl}-1,1,7,7-tetra­methyl-1,2,3,5,6,7-hexa­hydro­pyrido[3,2,1-ij]quinolin-9-ol 
The title Schiff base, C23H27ClN2O adopts the phenol–imine tautomeric form, with an intra­molecular O—H⋯N hydrogen bond, which generates an S(6) ring motif. Three C atoms of the heterocyclic moiety of the hexa­hydro­pyrido­quinoline unit, as well as the two methyl groups bonded to one of these C atoms, are disordered over two set of sites, with anoccupancy ratio of 0.740 (4):0.260 (4).
PMCID: PMC3685040  PMID: 23795059
2.  2-{[3-Chloro-4-(4-chloro­phen­oxy)phen­yl]imino­meth­yl}-4-nitro­phenol 
In the title compound, C19H12Cl2N2O4, the imine bond length of 1.257 (6) Å is typical of a double bond. The dihedral angle between the para-nitro benzene ring and the central benzene ring is 12.06 (3)° and that between the central benzene and the para-chloro benzene ring is 73.81 (2)°. An intra­molecular O—H⋯N hydrogen bond generates an S(6) ring motif. In the crystal, mol­ecules are linked together by two pairs of C—H⋯O interactions (to the same O atom acceptor), forming inversion dimers. A short Cl⋯Cl contact [3.232 (4) Å] is observed.
PMCID: PMC3685046  PMID: 23795065
3.  Ethyl 2-[2-(4-hy­droxy-3-meth­oxy­benzyl­idene)hydrazin-1-yl­idene]-3,4-dimethyl-2,3-dihydro-1,3-thia­zole-5-carboxyl­ate 
The title compound, C16H19N3O4S, is almost planar, with a dihedral angle of 2.88 (9)° between the mean planes of the benzene and thia­zole rings. The mol­ecule adopts an E conformation about the two C=N bonds, with a C—N—N—C torsion angle of −177.01 (11)°. An intra­molecular C—H⋯O hydrogen bond exists between a thia­zole methyl group and the formic acid ethyl ester carbonyl O atom. In the crystal, mol­ecules are linked by O—-H⋯O hydrogen bonds, forming chains propagating along [2-10]. The chains are linked via C—H⋯O hydrogen bonds with R 2 2(12) ring motifs, forming sheets lying parallel to (12-2). The sheets are further linked through out-of-plane C—H⋯N hydrogen bonds with R 2 2(12) ring motifs and C—H⋯π inter­actions, forming an inter­esting three-dimensional supra­molecular architecture.
PMCID: PMC3515300  PMID: 23284520
4.  1,1,2,2-Tetra­kis[2,4-dichloro-6-(dieth­oxy­meth­yl)phen­oxy­meth­yl]ethene 
In the title compound, C50H60Cl8O12, the mol­ecules are disordered about an inversion center located at the mid-point of the central C=C bond. These atoms show disorder and were modelled with two different orientations with site occupancies of 0.828 (3) and 0.172 (3). The dihedral angle between the two benzene rings in the asymmetric unit is 52.80 (6)°. Intramolecular C—H⋯O and C—H⋯Cl interactions occur and the crystal packing features inversion dimers linked by pairs of C—H⋯O bonds, generating R 2 2(10) loops.
PMCID: PMC3470353  PMID: 23125766
5.  4-Meth­oxy-2-{(E)-[(thio­phen-2-yl)methyl­imino]­meth­yl}phenol 
The title Schiff base, C13H13NO2S, adopts the phenol–imine tautomeric form and reveals an intra­molecular O—H⋯N hydrogen bond involving the hy­droxy group and the imino N atom, forming an S(6) ring. The mol­ecule is highly twisted with respect to the central imine group, which is reflected in the dihedral angle of 67.83 (10)° formed by the thienyl and phenol rings. The crystal packing is characterized by weak C—H⋯O and C—H⋯π inter­actions.
PMCID: PMC3435828  PMID: 22969674
6.  (E)-{[But-2-ene-1,4-diylbis(­oxy)]bis­(4,1-phenyl­ene)}bis­(phenyl­methanone) 
The title mol­ecule, C30H24O4, lies about an inversion center located at the mid-point of the central C=C bond. The diphenyl­methanone unit adopts an all-trans conformation. The dihedral angle between the adjacent rings is 53.57 (4)°.
PMCID: PMC3435660  PMID: 22969533
7.  4-[2-(4-Hy­droxy­phen­yl)eth­yl]-3-propyl-1H-1,2,4-triazol-5(4H)-one 
The asymmetric unit of the title compound, C13H17N3O2, contains eight crystallographically independent mol­ecules. The planes of the benzene and triazole rings in the eight mol­ecules make dihedral angles of 5.53 (13), 9.33 (13), 19.28 (11), 17.36 (8), 12.84 (12), 8.03 (8), 19.97 (11), and 7.98 (8)°. The eight mol­ecules in the asymmetric unit are linked by inter­molecular O—H⋯O and N—H⋯O hydrogen bonds, forming a three-dimensional network.
PMCID: PMC3379251  PMID: 22719449
8.  5-Diethyl­amino-2-[(E)-(2,4-dimeth­oxy­phen­yl)imino­meth­yl]phenol 
The title Schiff base, C19H24N2O3, exists in the crystal structure in the phenol–imine tautomeric form with an intra­molecular O—H⋯N hydrogen bond. The planes of the aromatic rings form a dihedral angle of 36.8 (8)°. The crystal packing is characterized by C—H⋯O hydrogen bonds and π–π stacking inter­actions [centroid–centroid distance = 3.478 (4)Å].
PMCID: PMC3379200  PMID: 22719398
9.  5-(Thio­phen-2-ylmeth­yl)-1,3,4-thia­diazol-2-amine 
In the title mol­ecule, C7H7N3S2, the dihedral angle between the thio­phene and thia­diazole rings is 72.99 (5)°; the two rings are oriented so that the S atoms in each ring are on the same side. In the crystal, the three-dimensional network involves strong N—H⋯O hydrogen bonds, as well as C—H⋯π and π–π stacking inter­actions [centroid–centroid distances = 3.654 (1) and 3.495 (1) Å].
PMCID: PMC3344432  PMID: 22590194
10.  4-(4-Meth­oxy­pheneth­yl)-3-methyl-1H-1,2,4-triazol-5(4H)-one 
The dihedral angle between the two rings in the title compound, C12H15N3O2, is 49.03 (1)°. The crystal structure is stabilized by inter­molecular N—H⋯O and C—H⋯O hydrogen bonds and π–π stacking inter­actions between the triazole rings with a centroid–centroid distance of 3.394 Å.
PMCID: PMC3007298  PMID: 21588442
11.  Ethyl 4-(3-ethyl-5-oxo-4,5-dihydro-1H-1,2,4-triazol-4-yl)benzoate 
In the title compound, C13H15N3O3, the dihedral angle between the two aromatic ring is 51.06 (1)°. In the crystal, mol­ecules are connected by pairs of N—H⋯O hydrogen bonds into centrosymmetric dimers.
PMCID: PMC2979362  PMID: 21579391
12.  4-(2,3-Dihydroxybenzyl­ideneamino)-3-methyl-1H-1,2,4-triazol-5(4H)-one 
All the non-H atoms of the title compound, C10H10N4O3, are almost coplanar, the maximum deviation from planarity being 0.065 (3) Å. The dihedral angle between the aromatic rings is 1.66 (6)°. The mol­ecule adopts the enol–imine tautomeric form with an intra­molecular hydrogen-bonding inter­action between the Schiff base N atom and the hydr­oxy group. In the crystal, inter­molecular N—H⋯O and O—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network.
PMCID: PMC2972010  PMID: 21578774

Results 1-12 (12)