N,N′-Bis(3-chloro-2-fluoro­benzyl­idene)ethane-1,2-diamine

The mol­ecule of the title centrosymmetric Schiff base compound, C16H12Cl2F2N2, adopts an E configuration with respect to the azomethine C=N bond. The imino groups are coplanar with the aromatic rings. Within the mol­ecule, the planar units are parallel, but extend in opposite directions from the dimethyl­ene bridge. An inter­esting feature of the crystal structure is the short inter­molecular Cl⋯F [3.1747 (5) Å] inter­actions, which are shorter than the sum of the van der Waals radii of these atoms. These inter­actions link neighbouring mol­ecules along the b axis. The crystal structure is further stabilized by π–π inter­actions, with a centroid–centroid distance of 3.5244 (4) Å

(E)-1,2-Bis(4-fluoro­phen­yl)ethane-1,2-dione

The title compound, C14H8F2O2, is a substituted benzil with an s-trans conformation of the dicarbonyl unit. This conformation is also shown by the O—C—C—O torsion angle of −110.65 (12)°. An unusual feature of the structure is the length, 1.536 (2) Å, of the central C—C bond connecting the carbonyl units, which is significantly longer than a normal Csp 2—Csp 2 single bond. This is probably the result of decreasing the unfavourable vicinal dipole–dipole inter­actions by increasing the distance between the two electronegative O atoms [O⋯O = 3.1867 (12) Å] and allowing orbital overlap of the dione with the π system of the benzene rings. The dihedral angle between the aromatic rings is 64.74 (5)°. In the crystal structure, neighbouring mol­ecules are linked together by weak inter­molecular C—H⋯O (× 2) hydrogen bonds. In addition, the crystal structure is further stabilized by inter­molecular π–π inter­actions with centroid–centroid distances in the range 3.6416 (6)–3.7150 (7) Å

2-(2-Thien­yl)-4,5-dihydro-1H-imidazole. Corrigendum

Corrigendum to Acta Cryst. (2009), E65, o301

A Novel Scheme for Intelligent Recognition of Pornographic Images

Harmful contents are rising in internet day by day and this motivates the essence of more research in fast and reliable obscene and immoral material filtering. Pornographic image recognition is an important component in each filtering system. In this paper, a new approach for detecting pornographic images is introduced. In this approach, two new features are suggested. These two features in combination with other simple traditional features provide decent difference between porn and non-porn images. In addition, we applied fuzzy integral based information fusion to combine MLP (Multi-Layer Perceptron) and NF (Neuro-Fuzzy) outputs. To test the proposed method, performance of system was evaluated over 18354 download images from internet. The attained precision was 93% in TP and 8% in FP on training dataset, and 87% and 5.5% on test dataset. Achieved results verify the performance of proposed system versus other related works

2-(4-Methoxy­phen­yl)-4,5-dihydro-1H-imidazole

In the title mol­ecule, C10H12N2O, the dihedral angle between the benzene and imidazole rings is 14.86 (16)°. The approximately planar arrangement of the mol­ecule results in a distance of 2.54 Å between an ortho-H atom of the benzene ring and the double-bonded N atom of the imidazole ring. In the crystal structure, symmetry-related mol­ecules are linked by inter­molecular N—H⋯N hydrogen bonds into one-dimensional chains extending along the a axis

2,2-Dimethyl-N,N′-bis­(4-nitro­benzyl­idene)propane-1,3-diamine

In the title compound, C19H20N4O4, a potential bidentate Schiff base ligand, each imino (C=N) functional group is coplanar with the adjacent benzene ring. The two benzene rings form a dihedral angle of 10.52 (6)°. Inter­molecular C—H⋯O contacts link neighbouring mol­ecules into supra­molecular array with an R 2 2(32) ring motif and a C—H⋯π contact is also present

[N,N′-Bis(4-bromo­benzyl­idene)-2,2-di­methyl­propane-κ2 N,N′]iodidocopper(I). Corrigendum

Corrigendum to Acta Cryst. (2009), E65, m289

2-[4-(4,5-Dihydro-1H-pyrrol-2-yl)phen­yl]-4,5-dihydro-1H-imidazole

The mol­ecule of the title compound, C12H14N4, lies about a crystallographic inversion centre. The five- and six-membered rings are twisted from each other, forming a dihedral angle of 18.06 (7)°. In the crystal structure, neighbouring mol­ecules are linked by inter­molecular N—H⋯N hydrogen bonds into one-dimensional infinite chains forming 18-membered rings with R 2 2(18) motifs. The crystal structure is further stabilized by weak inter­molecular π–π stacking [centroid–centroid distance = 3.8254 (6) Å] and C—H⋯π inter­actions