Tasneem A. Siddiquee

2,9-Bis(5-sulfanylidene-4,5-di-hydro-1,3,4-oxa-diazol-2-yl)-1,10-phenanthroline dimethyl sulfoxide disolvate.

In the title compound, C16H8N6O2S2·2C2H6OS, the phenanthroline molecule resides on a twofold axis, and the asymmetric unit also contains a slightly disordered [occupancy ratio for S atom of 0.95 (3):0.047 (3)] molecule of dimethyl sulfoxide. The O atoms of the solvent molecule accept hydrogen bonds from the N—H groups of the five-membered 2,3-dihydro-1,3,4-oxadiazole-2-thione ring. This ring is nearly coplanar with the phenanthroline ring, with a dihedral angle between their least-squares planes of 8.86 (6)°. In the crystal, the molecules are linked by C—H⋯O interactions.

5,7-Dibromo-3-trifluoro-methyl-3,4-dihydro-acridin-1(2H)-one.

In the title compound, C14H8Br2F3NO, the molecule is disordered across an approximate non-crystallographic mirror plane, which is in the plane of the fused ring system [The tetrahedral C atom bearing the trifluormethyl substituent is disordered with site occupancy factors of 0.80 (2) and 0.20 (2)]. In the crystal, a one-dimensional stacking of molecules involves interactions between the pyridine ring and symmetry-related Br and O atoms of adjacent molecules. The stacking distance between the mean planes of adjacent molecules is 3.395 (4) Å.

Ethyl 1-acetyl-1H-indole-3-carboxyl-ate.

The title compound, C13H13NO3, was synthesized by acetylation of ethyl 1H-indole-3-carboxylate. The aromatic ring system of the molecule is essentially planar, but the saturated ethyl group is also located within this plane and the overall r.m.s. deviation from planarity is only 0.034 Å. Pairs of C—H⋯O interactions connect molecules into chains along the diagonal of the unit cell. Molecules also form weakly connected dimers via π⋯π stacking interactions of the indole rings with centroid–centroid separations of 3.571 (1) Å. C—H⋯π interactions between methylene and methyl groups and the indole and benzene ring complete the directional intermolecular interactions found in the crystal structure.