The title compound, C(16)H(12)F(3)NO, a derivative of biologically active chalcones, comprises two benzene rings and a central -CH=CH-C(=O)- unit. The dihedral angle between the two rings is 10.9 (1)° and the mol-ecule adopts an E configuration about the central olefinic bond. The crystal structure is stabilized by inter-molecular N-H⋯O and N-H⋯N hydrogen bonds.

In this paper, it is proved that the group generated by Bass units contains a subgroup of finite index in central <mml:mi class="M...

This paper is focused on the commutativity of laws semiprime rings, which satisfy some algebraic identities involving homoderivations ideals. It provides new and notable results that will interest researchers in this field, such as “R contains a nonzero central ideal if R admits homoderivation δ I δ(I)⊆Z where ring with center Z R”. Moreover, research also generalizes previously published liter...

In the title compound, C17H21N5S2, the dihedral angles between the central pyridine ring and its pendant imidazole rings are 29.40 (9) and 40.77 (9)°; the pendant rings are twisted in an opposite sense with respect to the central ring. In each case, the S atom is approximately anti to the N atom of the pyridine ring. For both substituents, the H atom attached to the central C atom of the isopro...

In the title compound, C(36)H(44)N(4)O(4)S, the dihedral angles between the central thio-phene ring and the pendent oxadiazole rings are 12.7 (2) and 13.7 (2)°, and the dihedral angles between the oxadiazole rings and their adjacent benzene rings are 6.1 (2) and 17.5 (2)°. An intra-molecular C-H⋯O inter-action may help to establish the conformation.

Liesegang rings are uncommon pathological findings which may cause diagnostic dilemmas for pathologists. Awareness of their appearance is important to avoid over diagnosis of parasitic infection, algal contamination and psammoma bodies. Liesegang rings are benign, lamellar structures with radial striations and a central amorphous core. They are found in a variety of tissues and fluids in both a...

The structure of the title compound, C(23)H(18)N(2)S, is revealed by X-ray diffraction to be almost planar over all four aromatic rings; the pendant rings are at angles of 10.18, 14.12 and 15.42° relative to the central pyridine ring for the 4-methylsulfanyl, 2-pyridyl and 6-phenyl rings, respectively. The 2,6-aromatic substituents are disordered over two sites in a 0.6:0.4 occupancy ratio.

The asymmetric unit of the title compound, C(9)H(7)N(7)·2H(2)O, comprises three formula units. The dihedral angles between the triazole rings and the respective central pyridine rings are 4.87 (16)/1.39 (17), 6.46 (16)/7.61 (16) and 7.00 (16)/3.77 (17)°. The water mol-ecules form O-H⋯O hydrogen bonds between themselves and O-H⋯N hydrogen bonds with the N-atom acceptors of the triazole rings, pr...

In the title compound, C(18)H(20)O(4)S, the thio-phene and benzene rings are oriented at a dihedral angle of 10.83 (11)°. The central chain makes dihedral angles of 1.86 (13) and 9.25 (12)° with the benzene and thio-phene rings, respectively. In the crystal, mol-ecules are linked through weak inter-molecular C-H⋯O inter-actions. π-π inter-actions are also observed between the benzene rings with...