10H-Phenothiazine 5-oxide

Abstract

In the title compound, C12H9NOS, the sulfoxide O atom is disordered over two sites with occupancies of 0.907 (4) and 0.093 (4). The dihedral angle betweeen the two aromatic rings is 18.40 (14)degrees. Different types of supramolecular interactions including intermolecular N-H center dot center dot center dot O hydrogen bonds and pi-pi contacts [centroid-centroid distances = 3.9096 (16) and 4.1423 (16) angstrom] between the aromatic rings of symmetry-related molecules are observed in the crystal structure.